Black and White in Photoshop I 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 different 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