This enumeration specifies types of blending of two images.
IG_BLEND_OVER | Blend the first image over the second image. |
IG_BLEND_IN | Blend the first image into the second image. |
IG_BLEND_HELD_OUT | The first image is held out by the second image. |
IG_BLEND_LINEAR | The first and second images are combined in a linear fashion. |