Ability to copy/ paste infomation from R/G/B/Alpha channel of an image in the viewer.

[quockhanhlk]

The viewer currently already support viewing separate R/G/B/Alpha channel already, it would be such a huge improvement if it's possible to copy information from those channels to an external image editor (photoshop), and then paste the edited ones back into the image viewer ( for channel packing purposes - although photoshop or other image editors can do channel packing already, it would be great if the image viewer can also do this).

Great image viewer anyway, i really love it, thank you so much !