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 input.tif to generate a palette image that is written to output.tif. The generated col- ormap 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 com- pression. 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 un- dergo horizontal differencing before it is encoded; a value of 1 forces each scanline to be encoded without differencing. LZW-spe- cific options are specified by appending a :-separated list to the lzw option; e.g. -c lzw:2 for LZW compression with horizontal dif- ferencing. -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. SEE ALSO pal2rgb (1), tiffinfo (1), tiffcp (1), tiffcmp (1), libtiff (3tiff), "Color Image Quantization for Frame Buffer Display", Paul Heckbert, SIG- GRAPH proceedings, 1982, pp. 297-307. AUTHOR LibTIFF contributors COPYRIGHT 1988-2025, LibTIFF contributors 4.7 Sep 11, 2025 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+15.1.quarterly>