Auto Mask
Auto mask is a feature that can be used while compiling tilesets if one has never made a masking for the tileset before or just doesn’t wish to use it. Automask takes every color except for black (or in hex #000000 / 0 on all of the RGB values), or the other purple-ish transparency color (hex value #5700cb), then turns them into unmasked pixels, while every other color becomes masked.