Man1 - ximtoppm.1

ximtoppm - convert an Xim file to a PPM image

ximtoppm

[*–alphaout=*{alpha-filename,*-*}] [/ximfile/]

This program is part of *Netpbm*(1)

ximptoppm reads an Xim file as input and produces a PPM image as output. The Xim toolkit is included in the contrib tree of the X.V11R4 release.

You can abbreviate any option to its shortest unique prefix.

*–alphaout=*/alpha-filename/

ximtoppm creates a PGM 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.

Actually, an 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.

See *pamcomp*(1) for one way to use the alpha output file.

*pamcomp*(1) , *ppm*(5)

Copyright (C) 1991 by Jef Poskanzer.