Comparing two channels with Difference


show more Comparing two channels with Difference provides you with in-depth training on Design. Taught by Deke McClelland as part of the Photoshop CS3 Channels & Masks: Advanced Techniques show less
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Comparing two channels with Difference

In the last two exercises we used both the Add and the Subtract mode combined along with the Calculations command in order to create a couple of base alpha channels. Now if you are just joining me, I am working inside of a catch up document called ANS in action.tif. ANS standing of course for the Add and Subtract modes, and this image is found inside the 14 Calculations folder. If you go down to the bottom of the Channels palette, you'll see that we have one alpha channel that's called Add, -90, 1.4. -90 being the Offset value, 1.4 being the Scale value. And we have another one called Subtract, 90, 1.4. 90 being the Offset value, 1. 4 being the scale value.

Bear in mind that these two variations on the Alpha channel were created using slightly different settings for the base channels, for the Source 1 and the Source 2 channels. So in the case of Add we were taking an Inverted version of the Blue channel and adding an Inverted version of the Green channel to it. In the case of Su...

Comparing two channels with Difference
Video duration: 5m 23s 20h 47m Advanced

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Comparing two channels with Difference provides you with in-depth training on Design. Taught by Deke McClelland as part of the Photoshop CS3 Channels & Masks: Advanced Techniques

Subjects:
Design Photography
Software:
Photoshop
Author:
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