wrapping one image over other

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Parthiban.S (parthi++at++serc.serc.iisc.ernet.in)
Sun, 23 Feb 1997 20:05:09 +0000 (IST)

dear netters:
i would like to know the command for wrapping one image file over
other. i have used the command long time back. now i have forgotten
the command. this is availabe in SGI systems.

the usage is

command file1.rgb file2.rgb

this will put the file1.rgb on file2.rgb and we can see the second
image where ever the file1.rgb is transparent. (generally the
lighter regions are transparent and darker regions are opaque.)

thank u in advance for your help
parthi
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