Feature Suggestion: Ability to use Alpha Channel of Input Image

[Gotfind]

It would be useful if we could use not only the RGB channels of the Input Image but also the Alpha Channel.
Currently if we want to use image that's already packed in Alpha Channel of some Channel Packed image, we can't.

[fidifis]

I definitely plan to add this feature. It will probably come in the next feature release.
Thank you for the suggestion, I appreciate it.