TIFF2RGBA(1) General Commands Manual TIFF2RGBA(1)
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 im-
age. 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 eso-
teric 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 pla-
nar configuration contiguous. For this reason, this program is a use-
ful 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 Pack-
Bits 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 ap-
proximately 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 neces-
sary 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.
-M size
Set maximum memory allocation size (in MiB). The default is
256MiB. Set to 0 to disable the limit.
SEE ALSO
tiff2bw(1), TIFFReadRGBAImage(3t), libtiff(3)
Libtiff library home page: http://www.simplesystems.org/libtiff/
libtiff November 2, 2005 TIFF2RGBA(1)
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