Black and White in Photoshop I - Black and White in Photoshop CS4 and Photoshop Lightroom - page 133

Pre-Channel Mixing:

Step 1: Open an image that is in RGB color mode.
Step 2: Analyze the channels (Note: this step is for viewing purposes only).
Open your Channels palette and click on the individual channels by clicking on
the words “Red,” “Green” and “Blue”. These dif erent views will provide a guide for
how to customize the black and white conversion.
You will select the channel with the most detail and tonality to be the dominant
channel for the channel mixer on an image by image basis. The Red channel

Red Channel Green Channel Blue Channel