src/tiff/man/tiff2rgba.1

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