Man page - tiffmedian(1)

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libtiff-tools

Manual

TIFFMEDIAN

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
NOTES
SEE ALSO
AUTHOR
COPYRIGHT

NAME

tiffmedian - apply the median cut algorithm to data in a TIFF file

SYNOPSIS

tiffmedian [ options ] input.tif output.tif

DESCRIPTION

tiffmedian applies the median cut algorithm to an RGB image in input.tif to generate a palette image that is written to output.tif . The generated colormap has, by default, 256 entries. The image data is quantized by mapping each pixel to the closest color values in the colormap.

OPTIONS

-c

Specify the compression to use for data written to the output file: -c none for no compression, -c packbits for PackBits compression, -c lzw for Lempel-Ziv & Welch compression, -c zip for Deflate compression.

By default tiffmedian will compress data according to the value of the Compression tag found in the source file.

LZW compression can be specified together with a predictor value. A predictor value of 2 causes each scanline of the output image to undergo horizontal differencing before it is encoded; a value of 1 forces each scanline to be encoded without differencing. LZW-specific options are specified by appending a : -separated list to the lzw option; e.g. -c lzw:2 for LZW compression with horizontal differencing.

	-C		Specify the number of entries to use in the generated colormap. By default all 256 entries/colors are used.
	-f		Apply Floyd-Steinberg dithering before selecting a colormap entry.
	-r		Specify the number of rows (scanlines) in each strip of data written to the output file. By default, tiffmedian attempts to set the rows/strip that no more than 8 kilobytes of data appear in a strip.

NOTES

This program is derived from Paul Heckbert's median program.

AUTHOR

LibTIFF contributors

COPYRIGHT

1988-2022, LibTIFF contributors