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<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Color Quantization</title><link rel="stylesheet" type="text/css" href="../styles/main.css"><script language=JavaScript src="../javascript/main.js"></script><script language=JavaScript src="../javascript/prettify.js"></script><script language=JavaScript src="../javascript/searchdata.js"></script></head><body class="ContentPage" onLoad="NDOnLoad();prettyPrint();"><script language=JavaScript>
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if (browserType) {document.write("
");if (browserVer) {document.write("
"); }}// --></script>
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Color Quantization
Functions for truecolor to palette conversion
Summary
Color QuantizationFunctions for truecolor to palette conversion
Functions
gdImageTrueColorToPaletteSetMethodSelects the quantization method
gdImageTrueColorToPaletteSetQualityChooses a quality range for quantization
gdImageCreatePaletteFromTrueColorCreates a new palette image from a truecolor image
gdImageTrueColorToPaletteConverts a truecolor image to a palette image
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Functions
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gdImageTrueColorToPaletteSetMethod
int gdImageTrueColorToPaletteSetMethod (gdImagePtr im,
int method,
int speed)
Selects the quantization method
That quantization method is used for all subsequent gdImageTrueColorToPalette and gdImageCreatePaletteFromTrueColor calls.
Parameters
imThe image.
methodThe quantization method, see gdPaletteQuantizationMethod.
speedThe quantization speed between 1 (highest quality) and 10 (fastest).  0 selects a method-specific default (recommended).
Returns
Zero if the given method is invalid or not available; non-zero otherwise.
See also
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gdImageTrueColorToPaletteSetQuality
void gdImageTrueColorToPaletteSetQuality (gdImagePtr im,
int min_quality,
int max_quality)
Chooses a quality range for quantization
That quality range is used in all subsequent calls to gdImageTrueColorToPalette and gdImageCreatePaletteFromTrueColor if the quantization method is GD_QUANT_LIQ.
Parameters
imThe image.
min_qualityThe minimum quality in range 1-100 (1 = ugly, 100 = perfect).  If the palette cannot represent the image with at least min_quality, then no conversion is done.
max_qualityThe maximum quality in range 1-100 (1 = ugly, 100 = perfect), which must be higher than the min_quality.  If the palette can represent the image with a quality better than max_quality, then fewer colors than requested will be used.
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gdImageCreatePaletteFromTrueColor
gdImagePtr gdImageCreatePaletteFromTrueColor (gdImagePtr im,
int dither,
int colorsWanted)
Creates a new palette image from a truecolor image
Parameters
imThe image.
ditherWhether dithering should be applied.
colorsWantedThe number of desired palette entries.
Returns
A newly create palette image; NULL on failure.
See also
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gdImageTrueColorToPalette
int gdImageTrueColorToPalette (gdImagePtr im,
int dither,
int colorsWanted)
Converts a truecolor image to a palette image
Parameters
imThe image.
ditherWhether dithering should be applied.
colorsWantedThe number of desired palette entries.
Returns
Non-zero if the conversion succeeded, zero otherwise.
See also
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var searchPanel = new SearchPanel("searchPanel", "HTML", "../search");
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--></script>
<input type=text id=MSearchField value=Search onFocus="searchPanel.OnSearchFieldFocus(true)" onBlur="searchPanel.OnSearchFieldFocus(false)" onKeyUp="searchPanel.OnSearchFieldChange()"><select id=MSearchType onFocus="searchPanel.OnSearchTypeFocus(true)" onBlur="searchPanel.OnSearchTypeFocus(false)" onChange="searchPanel.OnSearchTypeChange()"><option  id=MSearchEverything selected value="General">Everything</option><option value="Constants">Constants</option><option value="Files">Files</option><option value="Functions">Functions</option><option value="Macros">Macros</option><option value="Types">Types</option></select>
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int gdImageTrueColorToPaletteSetMethod (gdImagePtr im,
int method,
int speed)
Selects the quantization method
void gdImageTrueColorToPaletteSetQuality (gdImagePtr im,
int min_quality,
int max_quality)
Chooses a quality range for quantization
gdImagePtr gdImageCreatePaletteFromTrueColor (gdImagePtr im,
int dither,
int colorsWanted)
Creates a new palette image from a truecolor image
int gdImageTrueColorToPalette (gdImagePtr im,
int dither,
int colorsWanted)
Converts a truecolor image to a palette image
A combination of algorithms used in libimagequant aiming for the highest quality at cost of speed.
gdImagePtr gdImageNeuQuant(gdImagePtr im,
const int max_color,
int sample_factor)
Creates a new palette image from a truecolor image
int gdImagePaletteToTrueColor(gdImagePtr src)
Convert a palette image to true color
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if (browserType) {if (browserVer) {document.write(""); }document.write("");}// --></script></body></html>

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