− convert an Xim file into a portable pixmap
Reads an Xim
file as input. Produces a portable pixmap as output. The Xim
toolkit is included in the contrib tree of the X.V11R4
ximtoppm creates a PGM
(portable graymap) file containing the alpha channel values
in the input image. If the input image doesn’t contain
an alpha channel, the alpha-filename file contains
all zero (transparent) alpha values. If you don’t
specify --alphaout, ximtoppm does not generate
an alpha file, and if the input image has an alpha channel,
ximtoppm simply discards it.
If you specify
- as the filename, ximtoppm writes the alpha
output to Standard Output and discards the image.
Xim image can contain an arbitrary fourth channel -- it need
not be an Alpha channel. ximtoppm extracts any fourth
channel it finds as described above; it doesn’t matter
if it is an alpha channel or not.
pnmcomp(1) for one way to use the alpha output
All options can
be abbreviated to their shortest unique prefix.
1991 by Jef Poskanzer.