Pixel depth
| qpx_BlackAndWhite | 1 | Black and white |
| qpx_FourColors | 2 | Four colors |
| qpx_SixteenColors | 4 | Sixteen colors |
| qpx_TwoHundredFiftySixColors | 8 | 256 colors |
| qpx_ThousandsColors | 16 | Thousands of colors |
| qpx_MillionColors | 24 | Million of colors |
| qpx_MillionColorsPlusAlpha | 32 | Million of colors plus alpha |
| qpx_FourGrays | 34 | Four grays |
| qpx_SixteenGrays | 36 | Sixteen grays |
| qpx_TwoHundredFiftySixGrays | 40 | 256 grays |