Graphics Programs Reference
In-Depth Information
Lab Color Mode
Another simple and relatively quick conversion method is to convert the
image to Lab Color mode and use the Lightness channel for the conversion.
You will need to delete the two channels that contain the color information,
labeled as “a” and “b”. As you delete the i rst color channel, however, the others
will automatically become renamed in the process. The Lightness channel
should remain fairly obvious, as the other remaining channel will appear
quite dark.
1. Choose Image Mode Lab Color
2. Open the Channels palette
3. Drag the “a” & “b” channels to the adjustment layer trash can. (The
Lightness channel will automatically rename to “Alpha 1”.)
 
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