| Value | Description |
|---|---|
| iaAlphaChannel | A TIEBitmap is used to store the transparency of the image. It is accessible via AlphaChannel and can be manipulated by all standard ImageEn functionality |
| iaRGBA | Uses the A channel of a 32bit RGBA (ie32RGB) format image. In this location, the alpha channel can only be manipulated using Pixels_ie32RGB or Alpha |
| iaNone | AlphaChannel and A channel of a 32bit RGBA are ignored. |