Working with Color

About color modes and models (Photoshop)
Color gamuts (Photoshop)
Adjusting the monitor display
Channels and bit depth (Photoshop)
Converting between color modes (Photoshop)
Converting between Grayscale and Bitmap modes (Photoshop)
Converting to indexed color (Photoshop)
Conversion options for indexed-color images (Photoshop)
Customizing indexed color tables (Photoshop)