MAN Solaris - tiffmedian (1)

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NAME

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

CONTENTS

SYNOPSIS

tiffmedian [options] input.tif output.tif

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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

The following options are supported:

-c Specify a compression scheme to use when writing image data:

-c lzw Lempel-Ziv and Welch algorithm.

-c none No compression.

-c packbits PackBits compression algorithm.

-c zip Deflate compression algorithm.

If no compression-related option is specified, the input-file compression algorithm is used.

-C Specify the number of entries to use in the generated colormap. By default, all 256 entries or colors are used.

-f Apply Floyd-Steinberg dithering before selecting a colormap entry.

-r Write data with a specified number of rows per strip. By default, the number of rows per strip is selected so that each strip is approximately 8 kilobytes.

OPERANDS

The following operands are supported:

input.tif The name of the input TIFF file.

output.tif The name of the output file.

EXTENDED DESCRIPTION

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 being encoded. A predictor value of 1 forces each scanline to be encoded without differencing.

LZW-specific options are specified by appending a colon-separated list to the lzw option. For example, specify -c lzw:2 for LZW compression with horizontal differencing.

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
AvailabilitySUNWTiff
Interface stabilityEvolving

SEE ALSO

Color Image Quantization for Frame Buffer Display, Paul Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307.

pal2rgb(1), tiffinfo(1), tiffcp(1), tiffcmp(1), libtiff(3)

NOTES

Updated by Breda McColgan, Sun Microsystems Inc., 2004.

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SunOS 5.11 tiffmedian (1) 26 Mar 2004
Generated by Open Solaris Forum from /usr/share/man/man1/tiffmedian.1 using man macros with tbl support.