Anthony Thyssen wrote:
David Vanderson on wrote...
| Hello,
|
| A few weeks ago we were doing cloud composition, which is close to
| something that I've been doing - setting the alpha channel of each pixel
| to the intensity of each pixel. Anthony asked why we were using -fx,
| which is slow, instead of -evaluate.
|
| I confess that I've tried and failed a few times to figure out how to do
| this with -evaluate. Can anyone enlighten me?
|
| Thanks,
| Dave
Note -channel A -fx intensity
was being used to mapp a greyscale to the alpha channel.
Try this instead.
convert image.png -colorspace gray \
-background white -channel A -combine ouptut.png
This does exactly what I want. Thank you very much.
Dave
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