TIFF2RGBA(1)							 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
       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 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
       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.

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 compres-
	      sion 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)



				June 13, 2001			 TIFF2RGBA(1)

UNIX/Linux commands referenced on this page:

1. convert
2. zip
3. at
4. time
5. file