CGBlendMode Enum
Definition
Blending mode used during composition.
public enum CGBlendModetype CGBlendMode = - Inheritance
-
CGBlendMode
Fields
| Clear | 16 | Clears the destination and makes it transparent (R=0). |
| Color | 14 | |
| ColorBurn | 7 | |
| ColorDodge | 6 | |
| Copy | 17 | Copies the source color with alpha to the target (R=S) |
| Darken | 4 | |
| DestinationAtop | 24 | |
| DestinationIn | 22 | |
| DestinationOut | 23 | |
| DestinationOver | 21 | |
| Difference | 10 | |
| Exclusion | 11 | |
| HardLight | 9 | |
| Hue | 12 | |
| Lighten | 5 | |
| Luminosity | 15 | |
| Multiply | 1 | |
| Normal | 0 | |
| Overlay | 3 | |
| PlusDarker | 26 | |
| PlusLighter | 27 | |
| Saturation | 13 | |
| Screen | 2 | |
| SoftLight | 8 | |
| SourceAtop | 20 | |
| SourceIn | 18 | |
| SourceOut | 19 | |
| XOR | 25 |
Remarks
The blend modes are used when composing images, the operations combine the color data with an alpha channel. The operations are called the Porter-Duff blending operations.
For a detailed explanation see the PDF reference manual.
In the explanation below, the following variables are used:
| Term | Description |
|---|---|
| R | Premultiplied result color |
| S | Source Color |
| D | Destination Color |
| Sa | Source alpha value |
| Da | Destination alpha value |