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 TIFFRead-
       RGBAImage() function, and it suffers  any  limitations  of
       that  image.   This  includes  limited  support  for  >  8
       BitsPerSample images, and flaws with some esoteric  combi-
       nations   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 con-
       tiguous.  For this reason, this program is a useful  util-
       ity 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 algo-
              rithm, -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, pro-
              ducing 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.remotesens-
       ing.org/libtiff/



libtiff                  November 2, 2005            TIFF2RGBA(1)