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 configuration contiguous.  For this reason, this program is a useful 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 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, 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)

       Libtiff library home page: http://www.simplesystems.org/libtiff/