None is the default (treats alpha as a regular channel) while Transparency and Premultiplied are hints. Currently there are some compressors that only support None, others that only support Transparency.
@ -67,5 +67,5 @@ Option 4:
=== Error Handling ===
* Error_Unknown should be 0
* Error_UserInterruption is not being used and could be removed.
* !Error_Unknown should be 0
* !Error_UserInterruption is not being used and could be removed.