Specifies color components (channels).
Values:
| IG_COLOR_COMP_ALL | All components. |
| IG_COLOR_COMP_R | R component of RGB color space. |
| IG_COLOR_COMP_G | G component of RGB color space. |
| IG_COLOR_COMP_B | B component of RGB color space. |
| IG_COLOR_COMP_RGB | R, G, B components of RGB color space. |
| IG_COLOR_COMP_I | I component of indexed RGB color space. |
| IG_COLOR_COMP_C | C component of CMYK color space. |
| IG_COLOR_COMP_M | M component of CMYK color space. |
| IG_COLOR_COMP_Y | Y component of CMYK color space. |
| IG_COLOR_COMP_K | K component of CMYK color space. |
| IG_COLOR_COMP_CMYK | C, M, Y, K components of CMYK color space. |
| IG_COLOR_COMP_YUV_Y | Y component of YUV color space. |
| IG_COLOR_COMP_YUV_U | U component of YUV color space. |
| IG_COLOR_COMP_YUV_V | V component of YUV color space. |
| IG_COLOR_COMP_YUV | Y, U, V components of YUV color space. |
| IG_COLOR_COMP_LAB_L | L component of LAB color space. |
| IG_COLOR_COMP_LAB_A | A component of LAB color space. |
| IG_COLOR_COMP_LAB_B | B component of LAB color space. |
| IG_COLOR_COMP_LAB | L, A, B components of LAB color space. |
| IG_COLOR_COMP_IHS_I | I component of IHS color space. |
| IG_COLOR_COMP_IHS_H | H component of IHS color space. |
| IG_COLOR_COMP_IHS_S | S component of IHS color space. |
| IG_COLOR_COMP_IHS | I, H, S components of IHS color space. |
| IG_COLOR_COMP_HLS_H | H component of HLS color space. |
| IG_COLOR_COMP_HLS_L | L component of HLS color space. |
| IG_COLOR_COMP_HLS_S | S component of HLS color space. |
| IG_COLOR_COMP_HLS | H, L, S component of HLS color space. |
| IG_COLOR_COMP_HSL_H | This value has been deprecated and will be removed from the public API in a future release. Please use IG_COLOR_COMP_HLS_H instead. |
| IG_COLOR_COMP_HSL_S | This value has been deprecated and will be removed from the public API in a future release. Please use IG_COLOR_COMP_HLS_S instead. |
| IG_COLOR_COMP_HSL_L | This value has been deprecated and will be removed from the public API in a future release. Please use IG_COLOR_COMP_HLS_L instead. |
| IG_COLOR_COMP_HSL | This value has been deprecated and will be removed from the public API in a future release. Please use IG_COLOR_COMP_HLS instead. |