1 bit - black and white
1 pixel
1-bit palette
16 colors
1x2 pixels
24 bits
24 bits - truecolor
24-bits RGB
2x1 pixels
2x2 pixels
32 bits
32 bits - smooth edges
32-bits RGBA
4 bits
4 bits - 16 colors
4-bits palette
4-bits palette RLE compressed
64px and bigger
8 bits
8 bits - 256 colors
Image editors, Image viewers, Icons & cursors, 3D graphics editors, Other applications