FreeBSD Manual Pages
TIFFMEDIAN(1) LibTIFF TIFFMEDIAN(1) 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 in- put.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 col- ormap. OPTIONS -c Specify the compression to use for data written to the output file: -c none for no compression, -c packbits for PackBits com- pression, -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 out- put image to undergo horizontal differencing before it is en- coded; 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 com- pression 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 en- try. -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. SEE ALSO pal2rgb (1), tiffinfo (1), tiffcp (1), tiffcmp (1), libtiff (3tiff), "Color Image Quantization for Frame Buffer Display", Paul Heckbert, SIGGRAPH proceedings, 1982, pp. 297-307. AUTHOR LibTIFF contributors COPYRIGHT 1988-2022, LibTIFF contributors 4.7 Sep 11, 2024 TIFFMEDIAN(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | NOTES | SEE ALSO | AUTHOR | COPYRIGHT
Want to link to this manual page? Use this URL:
<https://man.freebsd.org/cgi/man.cgi?query=tiffmedian&sektion=1&manpath=FreeBSD+Ports+14.3.quarterly>