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Calculations/apply image

Posted on 2000-04-26
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Last Modified: 2010-04-03
When do I want to use "calculation" and "apply image"?

(under the image-menu)

Give examples, please.
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Question by:Snubbenx
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weed earned 35 total points
ID: 2751810
This is straight from the Photoshop Bible:

"The calculations command performs a slightly different function than Apply Image. Rather than compositing a source image on top of the current target image, Calculations combines two source channels and puts the result in a target channel. Instead of affecting entire full color images the Calculations command affects individual color channels only. Only one channel changes as a result of this command."

Both commands are used for compositing/mixing two images or source channels. One creates a new channel, one just overwrites the foreground image. The implications are obvious. If you want to keep your channels intact use calculations, if you dont want to keep your channels as they were then use apply image. You can also use the calculations command for making selections and masks.
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by:Snubbenx
ID: 2752592
Thanks, weed
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