Using multichannel techniques

The one channel function I've so far ignored is Image ^ Mode ^ Multichannel. When you choose this command, Photoshop changes your image so that channels no longer have a specific relationship to one another. They don't mix to create a full-color image; instead, they exist independently within the confines of a single image. The multichannel mode is generally an intermediary step for converting between different color modes without recalculating the contents of the channels.

For example, normally when you convert between the RGB and CMYK modes, Photoshop maps RGB colors to the CMYK color model, changing the contents of each channel as demonstrated back in Figures 4-16 and 4-17. But suppose, just as an experiment, that you want to bypass the color mapping and instead transfer the exact contents of the red channel to the cyan channel, the contents of the green channel to the magenta channel, and so on. You convert from RGB to the multichannel mode and then from multichannel to CMYK as described in the following steps.

Learn Photoshop Now

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This first volume will guide you through the basics of Photoshop. Well start at the beginning and slowly be working our way through to the more advanced stuff but dont worry its all aimed at the total newbie.

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