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tiff2rgba - convert a TIFF
image to RGBA
color space
tiff2rgba [ options ] input.tif output.tif
Tiff2rgba
converts a wide variety of TIFF images into an RGBA TIFF image. This includes
the ability to translate different color spaces and photometric interpretation
into RGBA, support for alpha blending, and translation of many different
bit depths into a 32bit RGBA image.
Internally this program is implemented
using the TIFFReadRGBAImage() function, and it suffers any limitations
of that image. This includes limited support for > 8 BitsPerSample images,
and flaws with some esoteric combinations of BitsPerSample, photometric
interpretation, block organization and planar configuration.
The generated
images are stripped images with four samples per pixel (red, green, blue
and alpha) or if the -n flag is used, three samples per pixel (red, green,
and blue). The resulting images are always planar configuration contiguous.
For this reason, this program is a useful utility for transform exotic
TIFF files into a form ingestable by almost any TIFF supporting software.
- -c
- Specify a compression scheme to use when writing image data:
-c none for no compression (the default), -c packbits for the PackBits compression
algorithm, -c zip for the Deflate compression algorithm, -c jpeg for the
JPEG compression algorithm, and -c lzw for Lempel-Ziv & Welch.
- -r
- Write data
with a specified number of rows per strip; by default the number of rows/strip
is selected so that each strip is approximately 8 kilobytes.
- -b
- Process the
image one block (strip/tile) at a time instead of by reading the whole
image into memory at once. This may be necessary for very large images
on systems with limited RAM.
- -n
- Drop the alpha component from the output
file, producing a pure RGB file. Currently this does not work if the -b flag
is also in effect.
tiff2bw(1)
, TIFFReadRGBAImage(3t)
, libtiff(3)
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