GR32_AlphaPrec
GR32_AlphaShift
GR32_BitsPerPixel
GR32_BluePrec
GR32_BlueShift
GR32_ByteOrder
GR32_Depth
GR32_Format
GR32_GreenPrec
GR32_GreenShift
GR32_RedPrec
GR32_RedShift