Working with Color

About the different color modes (Photoshop)
Adjusting the monitor display
Channels and bit depth (Photoshop)
Converting between color modes (Photoshop)
Converting images to Bitmap mode (Photoshop)
Converting to indexed color (Photoshop)
Conversion options for indexed-color images (Photoshop)
Customizing indexed color tables (Photoshop)
Using the Adobe Color Picker
Using other color pickers
Using the color wheel