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TIFF2RGBA(1)		    General Commands Manual		  TIFF2RGBA(1)

       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 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.

       -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.

       tiff2bw(1), TIFFReadRGBAImage(3t), libtiff(3)

       Libtiff library home page:

libtiff			       November	2, 2005			  TIFF2RGBA(1)


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