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critoppm - convert CRI file (ERP Compressed Raster Image) to PPM (Portable
Pixel Map)
critoppm critoppm crifile ppmfile [-pal palfile]
critoppm
converts a CRI file to Portable PixMap file. The CRI format is used by
the vvsp(2)
program for ERP stimulus presentation. The PPM format is a
widely available graphics format, and a number of programs are available
to convert from the PPM format to many of the other popular file formats.
Thus, with the critoppm program, one should be able to easily convert CRI
files to a number of industry standard graphics files by first converting
the CRI file to PPM. See the man page for PPM(1)
for more information
on the PPM format, and available conversion programs.
crifile is the name
of the CRI file you wish to convert. crifile can be ’-’ to indicate that
the stdin should be read in order to facilitate the use of critoppm as
part of a UNIX pipe. ppmfile Is the name of the PPM file to be created.
If ppmfile already exists critoppm asks for permission to overwrite it.
ppmfile can be ’-’ in which case, critoppm writes it output to the stdout
stream in order to facilitate the use of critoppm as part of a UNIX pipe.
The -pal option directs critoppm to use palfile for color definitions
in the crifile. If the -pal option is not specified, critoppm will use
the default vvsp(2)
palette. (Note that you may view and edit the default
palette with the editvpal program).
- -pal palfile
- critoppm will use
the palette file palfile to determine the color values for Red/Green/Blue
to use in the ppmfile.
Let’s say you have a CRI file called pict1.cri,
it uses a palette file called pict1.pal, and you would like to create a
PCX file from it. You would first convert it to a PPM file, and then use
the utility program ppmtopcx to create the PCX file from the ppm file.
You could do this in a UNIX pipe like this:
critoppm pict1.cri - -pal pict1.pal
| ppmtopcx > pict1.pcx
None yet reported.
Ron Ohst
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