... need to start with one of those channels as the base of your grayscale conversion, With Photoshop CS4, the Black and White adjustment is the best option, but the Channel Mixer is a good ... immediately after applying the fi lter, and then you can tell Photoshop how to apply that fi lter to the original. If you choose Darken, Photoshop compares the fi ltered result with the original and ... affect the painted area. Photoshop will replace only the colors that you mouse over with the crosshair that shows up in the center of the brush cursor.When you paint, Photoshop uses your foreground...