.\" $Id: tiffgt.1,v 1.5 2016-09-25 20:05:52 bfriesen Exp $

.\"

.\" Copyright (c) 1988-1997 Sam Leffler

.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.

.\"

.\" Permission to use, copy, modify, distribute, and sell this software and 

.\" its documentation for any purpose is hereby granted without fee, provided

.\" that (i) the above copyright notices and this permission notice appear in

.\" all copies of the software and related documentation, and (ii) the names of

.\" Sam Leffler and Silicon Graphics may not be used in any advertising or

.\" publicity relating to the software without the specific, prior written

.\" permission of Sam Leffler and Silicon Graphics.

.\" 

.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 

.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 

.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  

.\" 

.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR

.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,

.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,

.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 

.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 

.\" OF THIS SOFTWARE.

.\"

.if n .po 0

.TH TIFFGT 1 "September 20, 2005" "libtiff"

.SH NAME

tiffgt \- display an image stored in a

.SM TIFF

file (Silicon Graphics version)

.SH SYNOPSIS

.B tiffgt

[

.I options

]

.I "input.tif ..."

.SH DESCRIPTION

.I tiffgt

displays one or more images stored using the

Tag Image File Format, Revision 6.0.

Each image is placed in a fixed size window that the

user must position on the display (unless configured

otherwise through X defaults).

If the display has fewer than 24 bitplanes, or if the

image does not warrant full color, then

.SM RGB

color values are mapped to the closest values that exist in

the colormap (this is done using the

.I rgbi

routine found in the graphics utility library

.BR \-lgutil .)

.PP

.I tiffgt

correctly handles files with any of the following characteristics:

.sp .5

.in +0.5i

.ta \w'\fIPhotometricInterpretation\fP  'u

.nf

\fIBitsPerSample\fP	1, 2, 4, 8, 16

\fISamplesPerPixel\fP	1, 3, 4 (the 4th sample is ignored)

\fIPhotometricInterpretation\fP	0 (min-is-white), 1 (min-is-black), 2 (RGB), 3 (palette), 6 (YCbCr)

\fIPlanarConfiguration\fP	1 (contiguous), 2 (separate)

\fIOrientation\fP	1 (top-left), 4 (bottom-left)

.fi

.in -0.5i

.sp .5

Data may be organized as strips or tiles and may be

compressed with any of the compression algorithms supported

by the 

.IR libtiff (3)

library.

.PP

For palette images (\c

.IR PhotometricInterpretation =3),

.I tiffgt

inspects the colormap values and assumes either 16-bit

or 8-bit values according to the maximum value.

That is, if no colormap entry greater than 255 is found,

.I tiffgt

assumes the colormap has only 8-bit values; otherwise

it assumes 16-bit values.

This inspection is done to handle old images written by

previous (incorrect) versions of

.IR libtiff .

.PP

.I tiffgt

can be used to display multiple images one-at-a-time.

The left mouse button switches the display to the first image in the

.I next

file in the list of files specified on the command line.

The right mouse button switches to the first image in the

.I previous

file in the list.

The middle mouse button causes the first image in the first file

specified on the command line to be displayed.

In addition the following keyboard commands are recognized:

.TP

.B b

Use a

.I PhotometricInterpretation

of MinIsBlack in displaying the current image.

.TP

.B l

Use a

.I FillOrder

of lsb-to-msb in decoding the current image.

.TP

.B m

Use a

.I FillOrder

of msb-to-lsb in decoding the current image.

.TP

.B c

Use a colormap visual to display the current image.

.TP

.B r

Use a true color (24-bit RGB) visual to display the current image.

.TP

.B w

Use a

.I PhotometricInterpretation

of MinIsWhite in displaying the current image.

.TP

.B W

Toggle (enable/disable) display of warning messages from the

.SM TIFF

library when decoding images.

.TP

.B E

Toggle (enable/disable) display of error messages from the

.SM TIFF

library when decoding images.

.TP

.B z

Reset all parameters to their default settings (\c

.IR FillOrder ,

.IR PhotometricInterpretation ,

handling of warnings and errors).

.TP

.B PageUp

Display the previous image in the current file or the last

image in the previous file.

.TP

.B PageDown

Display the next image in the current file or the first image

in the next file.

.TP

.B Home

Display the first image in the current file.

.TP

.B End

Display the last image in the current file (unimplemented).

.SH OPTIONS

.TP

.B \-c

Force image display in a colormap window.

.TP

.B \-d

Specify an image to display by directory number.

By default the first image in the file is displayed.

Directories are numbered starting at zero.

.TP

.B \-e

Enable reporting of error messages from the 

.SM TIFF

library.

By default

.I tiffgt

silently ignores images that cannot be read.

.TP

.B \-f

Force 

.I tiffgt

to run as a foreground process.

By default

.I tiffgt

will place itself in the background once it has opened the

requested image file.

.TP

.B \-l

Force the presumed bit ordering to be

.SM LSB

to

.SM MSB.

.TP

.B \-m

Force the presumed bit ordering to be

.SM MSB

to

.SM LSB.

.TP

.B \-o

Specify an image to display by directory offset.

By default the first image in the file is displayed.

Directories offsets may be specified using C-style syntax;

i.e. a leading ``0x'' for hexadecimal and a leading ``0'' for octal.

.TP

.B \-p

Override the value of the

.I PhotometricInterpretation

tag; the parameter may be one of:

.BR miniswhite ,

.BR minisblack ,

.BR rgb ,

.BR palette ,

.BR mask ,

.BR separated ,

.BR ycbcr ,

and

.BR cielab .

.TP

.B \-r

Force image display in a full color window.

.TP

.B \-s

Stop on the first read error.

By default all errors in the input data are ignored and 

.I tiffgt

does it's best to display as much of an image as possible.

.TP

.B \-w

Enable reporting of warning messages from the 

.SM TIFF

library.

By default

.I tiffgt

ignores warning messages generated when reading an image.

.TP

.B \-v

Place information in the title bar describing

what type of window (full color or colormap) is being

used, the name of the input file, and the directory

index of the image (if non-zero).

By default, the window type is not shown in the title bar.

.SH BUGS

Images wider and taller than the display are silently truncated to avoid

crashing old versions of the window manager.

.SH "SEE ALSO"

.BR tiffdump (1),

.BR tiffinfo (1),

.BR tiffcp (1),

.BR libtiff (3TIFF)

.PP

Libtiff library home page:

.BR http://www.simplesystems.org/libtiff/