Apply image & calculations: when and why please?

Would some one kindly indicate the thinking behind the use of these features?
What problems do they solve, when do we want to use them, etc. Thanks !

I use apply image to move pixels from one channel to another. The channel mixer adjustment layer is not spot-channel aware. It's also useful for moving pixels from one image to another.
I use calculations when making masks. A lot of times, using calculations on two channels will result in a better starting point for a mask than from one channel alone.
A video tut here: http://library.creativecow.net/articles/harrington_richard/photoshop_calculations/

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I tried to find documentation about exit RSR00003, but I didn´t found ...
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Muito obrigado,

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Message was edited by: iPodDiva

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Apply image & calculations: when and why please?

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