Likewise, you’ll have three LAB Channels check boxes in LAB Color mode and no Channels check boxes in Grayscale mode, because grayscale doesn’t include color…
In earlier versions of Photoshop, you could only turn off a channel for the entire image. With recent versions, however, you can modify the channels on a layer-by-layer basis.
The Channels check boxes on the Layer Style Dialog Box in Photoshop allow you to restrict the blending effects to a specific channel. By default, all channels are included.
Switching off one or more channels will give you different results depending on the colors used in your image.
For example, if you choose to exclude the Red channel in RGB Color mode, then only the information in the Green and Blue channels will be affected in the blending.
Once you uncheck one or more Channels in RGB Color mode, Photoshop will indicate it in the preview thumbnail on the right-hand side.
If I switch off the Red channel, for instance, the preview thumbnail will take on a red color.
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You’re more than welcome! Great to hear that the tutorial was helpful (: