"Ashton Peters" on wrote...
| Interstingly enough, I found the following on my machine (Vista, Core 2
| Duo):
|
| (r+g+b)^2/3^2 = 28 seconds
|
| (r+g+b)*(r+g+b)/9.0 = 40 seconds
|
| (r+g+b)^2/9.0 = 22 seconds
|
The image is grey-scale. so only one channel needs to be worked on!
convert nzcloudstc9.jpg -channel R -fx 'r^2' -separate \
squared_clouds.png
But then why are you mucking around with slow FX when you can use the
bulti-in image composition!!!!
convert nzcloudstc9.jpg \( +clone \) -compose multiply -composite \
squared_clouds.png
This runs in 2 seconds, most of which is probably disk IO!
and my machine is NOT very fast!
A lot of tasks that -fx can do, can also be done by builtin options
such as -evaluate -compose/-composite -distort
and as these do not interpret a string expresion over and over, they
are a lot faster.
Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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Dr Basher: `` Who told you that? '' Miles O'Brian: `` You did! ''
`` Well who am I to argue with me!! '' -- StarTrek DS9, ``Visions''
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Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/
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