UE4.9/4.10 & 4.14
Small Material function to improve optimization when used with masks.
Comes with a small guide/Tutorial on how to optimize the use of masks/separate RGB channels even further.
Which can be found here: https://www.youtube.com/watch?v=mzairog7Elw
This can save you between a few up to a few hundred MB per project :)
Note: Just put "0" into the amount you want to pay to download it for free :)
Additional photoshop tool needed: Crop_E_Assist tool for Photoshop: https://www.dropbox.com/s/sqm4846j80u2pr7/CropEAssist.7z