Identifies the different color spaces.
Values:
| IG_COLOR_SPACE_RGB | RGB. |
| IG_COLOR_SPACE_I | Intensity. |
| IG_COLOR_SPACE_IHS | IHS. |
| IG_COLOR_SPACE_HLS | HLS. |
| IG_COLOR_SPACE_Lab | Lab. |
| IG_COLOR_SPACE_YIQ | YIQ. |
| IG_COLOR_SPACE_CMY | CMY. |
| IG_COLOR_SPACE_CMYK | CMYK. |
| IG_COLOR_SPACE_YCrCb | YCrCb. |
| IG_COLOR_SPACE_YUV | YUV. |
| IG_COLOR_SPACE_MONO | FlashPix only: 8-bit grayscale. |
| IG_COLOR_SPACE_ALPHA | FlashPix only: 8-bit alpha. |
| IG_COLOR_SPACE_MA | FlashPix only: 16-bit: mono + alpha. |
| IG_COLOR_SPACE_AM | FlashPix only: 16-bit: alpha + mono. |
| IG_COLOR_SPACE_RGBA | FlashPix only: 32-bit: RGB + alpha. |
| IG_COLOR_SPACE_ARGB | FlashPix only: 32-bit: alpha + RGB. |
| IG_COLOR_SPACE_YCC | FlashPix only: 24-bit: photoYCC. |
| IG_COLOR_SPACE_YCCA | FlashPix only: 32-bit: photoYCC + alpha.. |
| IG_COLOR_SPACE_AYCC | FlashPix only: 32-bit: alpha + photoYCC. |
| IG_COLOR_SPACE_UNKNOWN | FlashPix only: unknown or invalid color space. |
| IG_COLOR_SPACE_NOCHANGE | FlashPix only: current color space. |
| IG_COLOR_SPACE_HSL | HSL. |