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April, 26th. 2006:
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TIFFMEDIAN
Section: User Commands (1) Updated: November 2, 2005 Index
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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:
none
for no compression,
packbits
for PackBits compression,
lzw
for Lempel-Ziv & Welch compression,
and
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.
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.
Libtiff library home page:
http://www.simplesystems.org/libtiff/
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- NOTES
-
- SEE ALSO
-
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