| cfa_to_rgb | Convert a single-channel color filter array image into an RGB image. |
| rgb1_to_gray | Transform an RGB image into a gray scale image. |
| rgb3_to_gray | Transform an RGB image to a gray scale image. |
| trans_from_rgb | Transform an image from the RGB color space to an arbitrary color space. |
| trans_to_rgb | Transform an image from an arbitrary color space to the RGB color space. |