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<div id=Content><div class="CFile"><div class=CTopic id=MainTopic><h1 class=CTitle><a name="Image_Filters"></a>Image Filters</h1><div class=CBody><!--START_ND_SUMMARY--><div class=Summary><div class=STitle>Summary</div><div class=SBorder><table border=0 cellspacing=0 cellpadding=0 class=STable><tr class="SMain"><td class=SEntry><a href="#Image_Filters" >Image Filters</a></td><td class=SDescription></td></tr><tr class="SGroup"><td class=SEntry><a href="#Functions" >Functions</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent1 SMarked"><td class=SEntry><a href="#gdImageScatter" id=link1 onMouseOver="ShowTip(event, 'tt1', 'link1')" onMouseOut="HideTip('tt1')">gdImageScatter</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent1"><td class=SEntry><a href="#gdImageScatterColor" id=link2 onMouseOver="ShowTip(event, 'tt2', 'link2')" onMouseOut="HideTip('tt2')">gdImageScatterColor</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent1 SMarked"><td class=SEntry><a href="#gdImageScatterEx" id=link3 onMouseOver="ShowTip(event, 'tt3', 'link3')" onMouseOut="HideTip('tt3')">gdImageScatterEx</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent1"><td class=SEntry><a href="#gdImagePixelate" id=link4 onMouseOver="ShowTip(event, 'tt4', 'link4')" onMouseOut="HideTip('tt4')">gdImagePixelate</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent1 SMarked"><td class=SEntry><a href="#gdImageNegate" id=link5 onMouseOver="ShowTip(event, 'tt5', 'link5')" onMouseOut="HideTip('tt5')">gdImageNegate</a></td><td class=SDescription>Invert an image</td></tr><tr class="SFunction SIndent1"><td class=SEntry><a href="#gdImageGrayScale" id=link6 onMouseOver="ShowTip(event, 'tt6', 'link6')" onMouseOut="HideTip('tt6')">gdImageGrayScale</a></td><td class=SDescription>Convert an image to grayscale</td></tr><tr class="SFunction SIndent1 SMarked"><td class=SEntry><a href="#gdImageBrightness" id=link7 onMouseOver="ShowTip(event, 'tt7', 'link7')" onMouseOut="HideTip('tt7')">gdImageBrightness</a></td><td class=SDescription>Change the brightness of an image</td></tr><tr class="SFunction SIndent1"><td class=SEntry><a href="#gdImageContrast" id=link8 onMouseOver="ShowTip(event, 'tt8', 'link8')" onMouseOut="HideTip('tt8')">gdImageContrast</a></td><td class=SDescription>Change the contrast of an image</td></tr><tr class="SFunction SIndent1 SMarked"><td class=SEntry><a href="#gdImageColor" id=link9 onMouseOver="ShowTip(event, 'tt9', 'link9')" onMouseOut="HideTip('tt9')">gdImageColor</a></td><td class=SDescription>Change channel values of an image</td></tr><tr class="SFunction SIndent1"><td class=SEntry><a href="#gdImageConvolution" id=link10 onMouseOver="ShowTip(event, 'tt10', 'link10')" onMouseOut="HideTip('tt10')">gdImageConvolution</a></td><td class=SDescription>Apply a convolution matrix to an image</td></tr><tr class="SFunction SIndent1 SMarked"><td class=SEntry><a href="#gdImageSelectiveBlur" id=link11 onMouseOver="ShowTip(event, 'tt11', 'link11')" onMouseOut="HideTip('tt11')">gdImageSelectiveBlur</a></td><td class=SDescription></td></tr><tr class="SFunction SIndent1"><td class=SEntry><a href="#gdImageEdgeDetectQuick" id=link12 onMouseOver="ShowTip(event, 'tt12', 'link12')" onMouseOut="HideTip('tt12')">gdImageEdgeDetectQuick</a></td><td class=SDescription>Edge detection of an image</td></tr><tr class="SFunction SIndent1 SMarked"><td class=SEntry><a href="#gdImageGaussianBlur" id=link13 onMouseOver="ShowTip(event, 'tt13', 'link13')" onMouseOut="HideTip('tt13')">gdImageGaussianBlur</a></td><td class=SDescription><a href="#gdImageGaussianBlur" class=LFunction id=link14 onMouseOver="ShowTip(event, 'tt13', 'link14')" onMouseOut="HideTip('tt13')">gdImageGaussianBlur</a> performs a Gaussian blur of radius 1 on the image. </td></tr><tr class="SFunction SIndent1"><td class=SEntry><a href="#gdImageEmboss" id=link15 onMouseOver="ShowTip(event, 'tt14', 'link15')" onMouseOut="HideTip('tt14')">gdImageEmboss</a></td><td class=SDescription>Emboss an image</td></tr><tr class="SFunction SIndent1 SMarked"><td class=SEntry><a href="#gdImageMeanRemoval" id=link16 onMouseOver="ShowTip(event, 'tt15', 'link16')" onMouseOut="HideTip('tt15')">gdImageMeanRemoval</a></td><td class=SDescription>Mean removal of an image</td></tr><tr class="SFunction SIndent1"><td class=SEntry><a href="#gdImageSmooth" id=link17 onMouseOver="ShowTip(event, 'tt16', 'link17')" onMouseOut="HideTip('tt16')">gdImageSmooth</a></td><td class=SDescription>Smooth an image</td></tr><tr class="SFunction SIndent1 SMarked"><td class=SEntry><a href="#gdImageCopyGaussianBlurred" >gdImageCopyGaussianBlurred</a></td><td class=SDescription>Return a copy of the source image <u>src</u> blurred according to the parameters using the Gaussian Blur algorithm.</td></tr></table></div></div><!--END_ND_SUMMARY--></div></div></div>
<div class="CGroup"><div class=CTopic><h3 class=CTitle><a name="Functions"></a>Functions</h3></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="gdImageScatter"></a>gdImageScatter</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageScatter(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>sub,</td></tr><tr><td></td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>plus</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="gdImageScatterColor"></a>gdImageScatterColor</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageScatterColor(</td><td class="PTypePrefix prettyprint " nowrap></td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap></td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>sub,</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap></td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>plus,</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap></td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>colors[],</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap>unsigned </td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>num_colors</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="gdImageScatterEx"></a>gdImageScatterEx</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageScatterEx(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType prettyprint " nowrap>gdScatterPtr </td><td class="PParameter prettyprint " nowrap>scatter</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="gdImagePixelate"></a>gdImagePixelate</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImagePixelate(</td><td class="PTypePrefix prettyprint " nowrap></td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap></td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>block_size,</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap>const unsigned </td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>mode</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="gdImageNegate"></a>gdImageNegate</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageNegate(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>src</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Invert an image</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>src</td><td class=CDLDescription>The image.</td></tr></table><h4 class=CHeading>Returns</h4><p>Non-zero on success, zero on failure.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="gdImageGrayScale"></a>gdImageGrayScale</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageGrayScale(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>src</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Convert an image to grayscale</p><p>The red, green and blue components of each pixel are replaced by their weighted sum using the same coefficients as the REC.601 luma (Y’) calculation. The alpha components are retained.</p><p>For palette images the result may differ due to palette limitations.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>src</td><td class=CDLDescription>The image.</td></tr></table><h4 class=CHeading>Returns</h4><p>Non-zero on success, zero on failure.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="gdImageBrightness"></a>gdImageBrightness</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageBrightness(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>src,</td></tr><tr><td></td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>brightness</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Change the brightness of an image</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>src</td><td class=CDLDescription>The image.</td></tr><tr><td class=CDLEntry>brightness</td><td class=CDLDescription>The value to add to the color channels of all pixels.</td></tr></table><h4 class=CHeading>Returns</h4><p>Non-zero on success, zero on failure.</p><h4 class=CHeading>See also</h4><ul><li><a href="#gdImageContrast" class=LFunction id=link18 onMouseOver="ShowTip(event, 'tt8', 'link18')" onMouseOut="HideTip('tt8')">gdImageContrast</a></li><li><a href="#gdImageColor" class=LFunction id=link19 onMouseOver="ShowTip(event, 'tt9', 'link19')" onMouseOut="HideTip('tt9')">gdImageColor</a></li></ul></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="gdImageContrast"></a>gdImageContrast</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageContrast(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>src,</td></tr><tr><td></td><td class="PType prettyprint " nowrap>double </td><td class="PParameter prettyprint " nowrap>contrast</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Change the contrast of an image</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>src</td><td class=CDLDescription>The image.</td></tr><tr><td class=CDLEntry>contrast</td><td class=CDLDescription>The contrast adjustment value. Negative values increase, postive values decrease the contrast. The larger the absolute value, the stronger the effect.</td></tr></table><h4 class=CHeading>Returns</h4><p>Non-zero on success, zero on failure.</p><h4 class=CHeading>See also</h4><ul><li><a href="#gdImageBrightness" class=LFunction id=link20 onMouseOver="ShowTip(event, 'tt7', 'link20')" onMouseOut="HideTip('tt7')">gdImageBrightness</a></li></ul></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="gdImageColor"></a>gdImageColor</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageColor(</td><td class="PTypePrefix prettyprint " nowrap></td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>src,</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap>const </td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>red,</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap>const </td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>green,</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap>const </td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>blue,</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap>const </td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>alpha</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Change channel values of an image</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>src</td><td class=CDLDescription>The image.</td></tr><tr><td class=CDLEntry>red</td><td class=CDLDescription>The value to add to the red channel of all pixels.</td></tr><tr><td class=CDLEntry>green</td><td class=CDLDescription>The value to add to the green channel of all pixels.</td></tr><tr><td class=CDLEntry>blue</td><td class=CDLDescription>The value to add to the blue channel of all pixels.</td></tr><tr><td class=CDLEntry>alpha</td><td class=CDLDescription>The value to add to the alpha channel of all pixels.</td></tr></table><h4 class=CHeading>Returns</h4><p>Non-zero on success, zero on failure.</p><h4 class=CHeading>See also</h4><ul><li><a href="#gdImageBrightness" class=LFunction id=link21 onMouseOver="ShowTip(event, 'tt7', 'link21')" onMouseOut="HideTip('tt7')">gdImageBrightness</a></li></ul></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="gdImageConvolution"></a>gdImageConvolution</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageConvolution(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>src,</td></tr><tr><td></td><td class="PType prettyprint " nowrap>float </td><td class="PParameter prettyprint " nowrap>filter[3][3],</td></tr><tr><td></td><td class="PType prettyprint " nowrap>float </td><td class="PParameter prettyprint " nowrap>filter_div,</td></tr><tr><td></td><td class="PType prettyprint " nowrap>float </td><td class="PParameter prettyprint " nowrap>offset</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Apply a convolution matrix to an image</p><p>Depending on the matrix a wide range of effects can be accomplished, e.g. blurring, sharpening, embossing and edge detection.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>src</td><td class=CDLDescription>The image.</td></tr><tr><td class=CDLEntry>filter</td><td class=CDLDescription>The 3x3 convolution matrix.</td></tr><tr><td class=CDLEntry>filter_div</td><td class=CDLDescription>The value to divide the convoluted channel values by.</td></tr><tr><td class=CDLEntry>offset</td><td class=CDLDescription>The value to add to the convoluted channel values.</td></tr></table><h4 class=CHeading>Returns</h4><p>Non-zero on success, zero on failure.</p><h4 class=CHeading>See also</h4><ul><li><a href="#gdImageEdgeDetectQuick" class=LFunction id=link22 onMouseOver="ShowTip(event, 'tt12', 'link22')" onMouseOut="HideTip('tt12')">gdImageEdgeDetectQuick</a></li><li><a href="#gdImageGaussianBlur" class=LFunction id=link23 onMouseOver="ShowTip(event, 'tt13', 'link23')" onMouseOut="HideTip('tt13')">gdImageGaussianBlur</a></li><li><a href="#gdImageEmboss" class=LFunction id=link24 onMouseOver="ShowTip(event, 'tt14', 'link24')" onMouseOut="HideTip('tt14')">gdImageEmboss</a></li><li><a href="#gdImageMeanRemoval" class=LFunction id=link25 onMouseOver="ShowTip(event, 'tt15', 'link25')" onMouseOut="HideTip('tt15')">gdImageMeanRemoval</a></li><li><a href="#gdImageSmooth" class=LFunction id=link26 onMouseOver="ShowTip(event, 'tt16', 'link26')" onMouseOut="HideTip('tt16')">gdImageSmooth</a></li></ul></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="gdImageSelectiveBlur"></a>gdImageSelectiveBlur</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageSelectiveBlur(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>src</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="gdImageEdgeDetectQuick"></a>gdImageEdgeDetectQuick</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageEdgeDetectQuick(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>src</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Edge detection of an image</p><img src="../images/edge_detect_quick.jpg" width="256" height="128"><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>src</td><td class=CDLDescription>The image.</td></tr></table><h4 class=CHeading>Returns</h4><p>Non-zero on success, zero on failure.</p><h4 class=CHeading>See also</h4><ul><li><a href="#gdImageMeanRemoval" class=LFunction id=link27 onMouseOver="ShowTip(event, 'tt15', 'link27')" onMouseOut="HideTip('tt15')">gdImageMeanRemoval</a></li><li><a href="#gdImageConvolution" class=LFunction id=link28 onMouseOver="ShowTip(event, 'tt10', 'link28')" onMouseOut="HideTip('tt10')">gdImageConvolution</a></li></ul></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="gdImageGaussianBlur"></a>gdImageGaussianBlur</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageGaussianBlur(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>im</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p><a href="#gdImageGaussianBlur" class=LFunction id=link29 onMouseOver="ShowTip(event, 'tt13', 'link29')" onMouseOut="HideTip('tt13')">gdImageGaussianBlur</a> performs a Gaussian blur of radius 1 on the image. The image is modified in place.</p><p><b>NOTE:</b> You will almost certain want to use <a href="#gdImageCopyGaussianBlurred" class=LFunction id=link30 onMouseOver="ShowTip(event, 'tt17', 'link30')" onMouseOut="HideTip('tt17')">gdImageCopyGaussianBlurred</a> instead, as it allows you to change your kernel size and sigma value. Future versions of this function may fall back to calling it instead of <a href="#gdImageConvolution" class=LFunction id=link31 onMouseOver="ShowTip(event, 'tt10', 'link31')" onMouseOut="HideTip('tt10')">gdImageConvolution</a>, causing subtle changes so be warned.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>im</td><td class=CDLDescription>The image to blur</td></tr></table><h4 class=CHeading>Returns</h4><p>GD_TRUE (1) on success, GD_FALSE (0) on failure.</p></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="gdImageEmboss"></a>gdImageEmboss</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageEmboss(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>im</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Emboss an image</p><img src="../images/emboss.jpg" width="256" height="128"><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>im</td><td class=CDLDescription>The image.</td></tr></table><h4 class=CHeading>Returns</h4><p>Non-zero on success, zero on failure.</p><h4 class=CHeading>See also</h4><ul><li><a href="#gdImageConvolution" class=LFunction id=link32 onMouseOver="ShowTip(event, 'tt10', 'link32')" onMouseOut="HideTip('tt10')">gdImageConvolution</a></li></ul></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="gdImageMeanRemoval"></a>gdImageMeanRemoval</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageMeanRemoval(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>im</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Mean removal of an image</p><img src="../images/mean_removal.jpg" width="256" height="128"><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>im</td><td class=CDLDescription>The image.</td></tr></table><h4 class=CHeading>Returns</h4><p>Non-zero on success, zero on failure.</p><h4 class=CHeading>See also</h4><ul><li><a href="#gdImageEdgeDetectQuick" class=LFunction id=link33 onMouseOver="ShowTip(event, 'tt12', 'link33')" onMouseOut="HideTip('tt12')">gdImageEdgeDetectQuick</a></li><li><a href="#gdImageConvolution" class=LFunction id=link34 onMouseOver="ShowTip(event, 'tt10', 'link34')" onMouseOut="HideTip('tt10')">gdImageConvolution</a></li></ul></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="gdImageSmooth"></a>gdImageSmooth</h3><div class=CBody><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageSmooth(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType prettyprint " nowrap>float </td><td class="PParameter prettyprint " nowrap>weight</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote><p>Smooth an image</p><img src="../images/smooth.jpg" width="256" height="128"><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>im</td><td class=CDLDescription>The image.</td></tr><tr><td class=CDLEntry>weight</td><td class=CDLDescription>The strength of the smoothing.</td></tr></table><h4 class=CHeading>Returns</h4><p>Non-zero on success, zero on failure.</p><h4 class=CHeading>See also</h4><ul><li><a href="#gdImageConvolution" class=LFunction id=link35 onMouseOver="ShowTip(event, 'tt10', 'link35')" onMouseOut="HideTip('tt10')">gdImageConvolution</a></li></ul></div></div></div>
<div class="CFunction"><div class=CTopic><h3 class=CTitle><a name="gdImageCopyGaussianBlurred"></a>gdImageCopyGaussianBlurred</h3><div class=CBody><p>Return a copy of the source image <u>src</u> blurred according to the parameters using the Gaussian Blur algorithm.</p><p><u>radius</u> is a radius, not a diameter so a radius of 2 (for example) will blur across a region 5 pixels across (2 to the center, 1 for the center itself and another 2 to the other edge).</p><p><u>sigma</u> represents the “fatness” of the curve (lower == fatter). If <u>sigma</u> is less than or equal to 0, <a href="#gdImageCopyGaussianBlurred" class=LFunction id=link36 onMouseOver="ShowTip(event, 'tt17', 'link36')" onMouseOut="HideTip('tt17')">gdImageCopyGaussianBlurred</a> ignores it and instead computes an “optimal” value. Be warned that future versions of this function may compute sigma differently.</p><p>The resulting image is always truecolor.</p><h4 class=CHeading>More Details</h4><p>A Gaussian Blur is generated by replacing each pixel’s color values with the average of the surrounding pixels’ colors. This region is a circle whose radius is given by argument <u>radius</u>. Thus, a larger radius will yield a blurrier image.</p><p>This average is not a simple mean of the values. Instead, values are weighted using the Gaussian function (roughly a bell curve centered around the destination pixel) giving it much more influence on the result than its neighbours. Thus, a fatter curve will give the center pixel more weight and make the image less blurry; lower <u>sigma</u> values will yield flatter curves.</p><p>Currently, <a href="#gdImageCopyGaussianBlurred" class=LFunction id=link37 onMouseOver="ShowTip(event, 'tt17', 'link37')" onMouseOut="HideTip('tt17')">gdImageCopyGaussianBlurred</a> computes the default sigma as</p><p>(2/3)*radius</p><p>Note, however that we reserve the right to change this if we find a better ratio. If you absolutely need the current sigma value, you should set it yourself.</p><h4 class=CHeading>Parameters</h4><table border=0 cellspacing=0 cellpadding=0 class=CDescriptionList><tr><td class=CDLEntry>src</td><td class=CDLDescription>the source image</td></tr><tr><td class=CDLEntry>radius</td><td class=CDLDescription>the blur radius (<b>not</b> diameter--range is 2*radius + 1)</td></tr><tr><td class=CDLEntry>sigma</td><td class=CDLDescription>the sigma value or a value <= 0.0 to use the computed default</td></tr></table><h4 class=CHeading>Returns</h4><p>The new image or NULL if an error occurred. The result is always truecolor.</p><h4 class=CHeading>Example</h4><blockquote><pre class="prettyprint">FILE *in;
gdImagePtr result, src;
in = fopen("foo.png", "rb");
src = gdImageCreateFromPng(in);
result = gdImageCopyGaussianBlurred(im, src->sx / 10, -1.0);</pre></blockquote></div></div></div>
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<div class=CToolTip id="tt1"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageScatter(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>sub,</td></tr><tr><td></td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>plus</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div><div class=CToolTip id="tt2"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageScatterColor(</td><td class="PTypePrefix prettyprint " nowrap></td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap></td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>sub,</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap></td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>plus,</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap></td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>colors[],</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap>unsigned </td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>num_colors</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div><div class=CToolTip id="tt3"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageScatterEx(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType prettyprint " nowrap>gdScatterPtr </td><td class="PParameter prettyprint " nowrap>scatter</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div><div class=CToolTip id="tt4"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImagePixelate(</td><td class="PTypePrefix prettyprint " nowrap></td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap></td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>block_size,</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap>const unsigned </td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>mode</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div><div class=CToolTip id="tt5"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageNegate(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>src</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Invert an image</div></div><div class=CToolTip id="tt6"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageGrayScale(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>src</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Convert an image to grayscale</div></div><div class=CToolTip id="tt7"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageBrightness(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>src,</td></tr><tr><td></td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>brightness</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Change the brightness of an image</div></div><div class=CToolTip id="tt8"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageContrast(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>src,</td></tr><tr><td></td><td class="PType prettyprint " nowrap>double </td><td class="PParameter prettyprint " nowrap>contrast</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Change the contrast of an image</div></div><div class=CToolTip id="tt9"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageColor(</td><td class="PTypePrefix prettyprint " nowrap></td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>src,</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap>const </td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>red,</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap>const </td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>green,</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap>const </td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>blue,</td></tr><tr><td></td><td class="PTypePrefix prettyprint " nowrap>const </td><td class="PType prettyprint " nowrap>int </td><td class="PParameter prettyprint " nowrap>alpha</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Change channel values of an image</div></div><div class=CToolTip id="tt10"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageConvolution(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>src,</td></tr><tr><td></td><td class="PType prettyprint " nowrap>float </td><td class="PParameter prettyprint " nowrap>filter[3][3],</td></tr><tr><td></td><td class="PType prettyprint " nowrap>float </td><td class="PParameter prettyprint " nowrap>filter_div,</td></tr><tr><td></td><td class="PType prettyprint " nowrap>float </td><td class="PParameter prettyprint " nowrap>offset</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Apply a convolution matrix to an image</div></div><div class=CToolTip id="tt11"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageSelectiveBlur(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>src</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote></div></div><div class=CToolTip id="tt12"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageEdgeDetectQuick(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>src</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Edge detection of an image</div></div><div class=CToolTip id="tt13"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageGaussianBlur(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>im</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>gdImageGaussianBlur performs a Gaussian blur of radius 1 on the image. </div></div><div class=CToolTip id="tt14"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageEmboss(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>im</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Emboss an image</div></div><div class=CToolTip id="tt15"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageMeanRemoval(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>im</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Mean removal of an image</div></div><div class=CToolTip id="tt16"><div class=CFunction><blockquote><table border=0 cellspacing=0 cellpadding=0 class="Prototype"><tr><td><table border=0 cellspacing=0 cellpadding=0><tr><td class="PBeforeParameters prettyprint "nowrap>int gdImageSmooth(</td><td class="PType prettyprint " nowrap>gdImagePtr </td><td class="PParameter prettyprint " nowrap>im,</td></tr><tr><td></td><td class="PType prettyprint " nowrap>float </td><td class="PParameter prettyprint " nowrap>weight</td><td class="PAfterParameters prettyprint "nowrap>)</td></tr></table></td></tr></table></blockquote>Smooth an image</div></div><div class=CToolTip id="tt17"><div class=CFunction>Return a copy of the source image <u>src</u> blurred according to the parameters using the Gaussian Blur algorithm.</div></div><!--END_ND_TOOLTIPS-->
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