RGB Mask packing

[CorvaeOboro]

Expresso Exporter for Photoshop CC can export to specified channels by unlocking the output.
it makes for a really nice easiliy readable psd.

https://forums.unrealengine.com/showthread.php?49700-Photoshop-Plugin-Expresso-Exporter-quickly-export-texture-maps-out-of-PSDs