Walk-Behinds using alpha channels

[Fritos]

Are we capable of using alpha channels for our walk-behind areas? I tried importing a 32bit walk-behind with an alpha but nothing, so I'm thinking not?! If not, does this mean using alpha objects for the blending?

[Gilbert]

No (not yet at least), walkbehinds masks are just 256 colour images with each solid colour representing one walkbehind area.

Currently you may use a sprite with alpha channel instead but beware that using a large alpha-blended sprite may cause slowdowns.

[Pumaman]

Only characters, objects, mouse cursors and GUI backgrounds support being drawn with an alpha channel in-game.