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/