NAME¶
tiff2rgba - convert a
TIFF image to RGBA color space
SYNOPSIS¶
tiff2rgba [
options ]
input.tif output.tif
DESCRIPTION¶
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 ingestible by almost any TIFF
supporting software.
OPTIONS¶
- -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.
SEE ALSO¶
tiff2bw(1),
TIFFReadRGBAImage(3t),
libtiff(3)
Libtiff library home page:
http://www.remotesensing.org/libtiff/