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 function.  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 striprows
              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.

       -B     Use this value as the background when doing alpha compositing (dropping the alpha component).

       -M size
              Set maximum memory allocation size (in MiB). The default is 256MiB.   Set  to  0  to  disable  the
              limit.

SEE ALSO

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

AUTHOR

       LibTIFF contributors

COPYRIGHT

       1988-2022, LibTIFF contributors

4.7                                               Apr 30, 2025                                      TIFF2RGBA(1)