UE4 - Advanced Mask Texture Optimisation Tutorial
Small guide/Tutorial on how to optimize the use of masks/separate RGB channels even further.
This can save you between a few up to a few hundred MB per project :)
Crop_E_Assist tool for Photoshop: https://www.dropbox.com/s/sqm4846j80u...
(Epic created the original one, I modified it to work on newer Photoshop versions)
Luos's Cropping Mat Function: https://gum.co/qhVXf
Enjoy!