tiff2rgba(1)

TIFF2RGBA(1)             USER COMMANDS               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 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 confi-
     guration 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 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,  produc-
          ing  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)

                   Last change: June 13, 2001                   1