src/tiff/man/tiff2rgba.1

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  24 .if n .po 0
  25 .TH TIFF2RGBA 1 "November 2, 2005" "libtiff"
  26 .SH NAME
  27 tiff2rgba \- convert a
  28 .SM TIFF
  29 image to RGBA color space
  30 .SH SYNOPSIS
  31 .B tiff2rgba
  32 [
  33 .I options
  34 ]
  35 .I input.tif
  36 .I output.tif
  37 .SH DESCRIPTION
  38 .I Tiff2rgba
  39 converts a wide variety of TIFF images into an RGBA TIFF image.  This
  40 includes the ability to translate different color spaces and photometric
  41 interpretation into RGBA, support for alpha blending, and translation
  42 of many different bit depths into a 32bit RGBA image.
  43 .P
  44 Internally this program is implemented using the
  45 .I TIFFReadRGBAImage()
  46 function, and it suffers any limitations of that image.  This includes
  47 limited support for > 8 BitsPerSample images, and flaws with some
  48 esoteric combinations of BitsPerSample, photometric interpretation,
  49 block organization and planar configuration.
  50 .P
  51 The generated images are stripped images with four samples per pixel
  52 (red, green, blue and alpha) or if the
  53 .B \-n
  54 flag is used, three samples
  55 per pixel (red, green, and blue).  The resulting images are always planar
  56 configuration contiguous.  For this reason, this program is a useful utility
  57 for transform exotic TIFF files into a form ingestible by almost any TIFF
  58 supporting software.
  59 .SH OPTIONS
  60 .TP
  61 .B \-c
  62 Specify a compression scheme to use when writing image data:
  63 .B "\-c none"
  64 for no compression (the default),
  65 .B "\-c packbits"
  66 for the PackBits compression algorithm,
  67 .B "\-c zip"
  68 for the Deflate compression algorithm,
  69 .B "\-c jpeg"
  70 for the JPEG compression algorithm,
  71 and
  72 .B "\-c lzw"
  73 for Lempel-Ziv & Welch.
  74 .TP
  75 .B \-r
  76 Write data with a specified number of rows per strip;
  77 by default the number of rows/strip is selected so that each strip
  78 is approximately 8 kilobytes.
  79 .TP
  80 .B \-b
  81 Process the image one block (strip/tile) at a time instead of by reading
  82 the whole image into memory at once.  This may be necessary for very large
  83 images on systems with limited RAM.
  84 .TP
  85 .B \-n
  86 Drop the alpha component from the output file, producing a pure RGB file.
  87 Currently this does not work if the
  88 .B \-b
  89 flag is also in effect.
  90 .SH "SEE ALSO"
  91 .BR tiff2bw (1),
  92 .BR TIFFReadRGBAImage (3t),
  93 .BR libtiff (3)
  94 .PP
  95 Libtiff library home page:
  96 .BR http://www.remotesensing.org/libtiff/