| Value | Meaning |
|---|---|
| UndefinedPreview | |
| RotatePreview | ditto |
| ShearPreview | ditto |
| RollPreview | ditto |
| HuePreview | ditto |
| SaturationPreview | ditto |
| BrightnessPreview | ditto |
| GammaPreview | ditto |
| SpiffPreview | ditto |
| DullPreview | ditto |
| GrayscalePreview | ditto |
| QuantizePreview | ditto |
| DespecklePreview | ditto |
| ReduceNoisePreview | ditto |
| AddNoisePreview | ditto |
| SharpenPreview | ditto |
| BlurPreview | ditto |
| ThresholdPreview | ditto |
| EdgeDetectPreview | ditto |
| SpreadPreview | ditto |
| SolarizePreview | ditto |
| ShadePreview | ditto |
| RaisePreview | ditto |
| SegmentPreview | ditto |
| SwirlPreview | ditto |
| ImplodePreview | ditto |
| WavePreview | ditto |
| OilPaintPreview | ditto |
| CharcoalDrawingPreview | ditto |
| JPEGPreview | ditto |
Image preview type.