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OpenGL Internal Texture Formats. Each internal texture format has a corresponding base internal format and its desired component resolutions.
Sized Base R G B A L I
Internal Format Internal Format bits bits bits bits bits bits
ALPHA4 ALPHA 4
ALPHA8 ALPHA 8
ALPHA12 ALPHA 12
ALPHA16 ALPHA 16
LUMINANCE4 LUMINANCE 4
LUMINANCE8 LUMINANCE 8
LUMINANCE12 LUMINANCE 12
LUMINANCE16 LUMINANCE 16
LUMINANCE4_ALPHA4 LUMINANCE_ALPHA 4 4
LUMINANCE6_ALPHA2 LUMINANCE_ALPHA 2 6
LUMINANCE8_ALPHA8 LUMINANCE_ALPHA 8 8
LUMINANCE12_ALPHA4 LUMINANCE_ALPHA 12 4
LUMINANCE16_ALPHA16 LUMINANCE_ALPHA 16 16
INTENSITY4 INTENSITY 4
INTENSITY8 INTENSITY 8
INTENSITY12 INTENSITY 12
INTENSITY16 INTENSITY 16
R3_G3_B2 RGB 3 3 2
RGB4 RGB 4 4 4
RGB5 RGB 5 5 5
RGB8 RGB 8 8 8
RGB10 RGB 10 10 10
RGB12 RGB 12 12 12
RGB16 RGB 16 16 16
RGBA2 RGBA 2 2 2 2
RGBA4 RGBA 4 4 4 4
RGB5_A1 RGBA 5 5 5 1
RGBA8 RGBA 8 8 8 8
RGB10_A2 RGBA 10 10 10 2
RGBA12 RGBA 12 12 12 12
RGBA16 RGBA 16 16 16 16