These are all the possible values for the IG_ISIS_TAG_PHOTOMETRICINTERPRETATION tag.
Values:
| IG_ISIS_PHOTOMETRIC_WHITE0 | 0 is imaged as white, 1 is imaged as black. |
| IG_ISIS_PHOTOMETRIC_WHITE1 | 0 is imaged as black, 1 is imaged as white. |
| IG_ISIS_PHOTOMETRIC_RGB | RGB image. |
| IG_ISIS_PHOTOMETRIC_PALETTE | Palette color image. |
| IG_ISIS_PHOTOMETRIC_BGR | Same as RGB, but blue and red planes are reversed. |