ilbmtoppm



Ilbmtoppm User Manual(0)                              Ilbmtoppm User Manual(0)




NAME

       ilbmtoppm - convert an ILBM file into a PPM image



SYNOPSIS

       ilbmtoppm [-verbose] [-ignore<chunkID>] [-isham|-isehb] [-adjustcolors]
       [ILBMfile]



DESCRIPTION

       This program is part of Netpbm(1).

       ilbmtoppm reads an IFF ILBM file as input and produces a PPM  image  as
       output.  ilbmtoppm can handle the following ILBM types:



       ·      Normal ILBMs with 1-16 planes.

       ·      Amiga Extra_Halfbrite (EHB)

       ·      Amiga HAM with 3-16 planes.

       ·      24 bit.

       ·      Multiplatte (normal or HAM) pictures.

       ·      Color map (BMHD + CMAP chunk only, nPlanes = 0).

       ·      Unofficial  direct color.  1-16 planes for each color component.


       ilbmtoppm uses these ILBM chunks: BMHD, CMAP,  CAMG  (only  HAM  &  EHB
       flags  used), PCHG, BODY unofficial DCOL chunk to identify direct color
       ILBM.  It ignores these chunks: GRAB, DEST,  SPRT,  CRNG,  CCRT,  CLUT,
       DPPV,  DRNG,  EPSF.   It  ignores, but displays in verbose mode, these:
       NAME, AUTH, (c), ANNO, DPI.  It skips chunks whose type it doesn’t rec-
       ognize.



OPTIONS

       -verbose
              Give some information about the ILBM file.


       -ignore chunkID
              Skip  a  chunk.  chunkID is the 4-letter IFF chunk identifier of
              the chunk to be skipped.


       -isham | -isehb
              Treat the input file as a HAM or Extra_Halfbrite  picture,  even
              if  these flags are not set in the CAMG chunk (or if there is no
              CAMG chunk).


       -adjustcolors
              If all colors in the CMAP have a value of less  then  16,  ilbm-
              toppm  assumes  a 4-bit colormap and gives a warning.  With this
              option the colormap is scaled to 8 bits.





LIMITATIONS

       The multipalette PCHG BigLineChanges and Huffman decompression code  is
       untested.



REFERENCES

       Amiga  ROM Kernel Reference Manual - Devices (3rd Ed.)  Addison Wesley,
       ISBN 0-201-56775-X



SEE ALSO

       ppmtoilbm(1), ppm(1)



AUTHORS

       Copyright (C) 1989 by Jef Poskanzer.

       Modified October 1993 by Ingo Wilken (Ingo.Wilken@informatik.uni-olden-
       burg.de)



netpbm documentation            04 October 1993       Ilbmtoppm User Manual(0)

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