Setting or key to convert to RGB vs RGBA

[alexilyaev]

Is it possible to convert to RGB vs RGBA?

RGBA is supported only from IE9:
http://msdn.microsoft.com/en-us/library/hh781508(v=vs.85).aspx (search rgba)
http://caniuse.com/#search=rgba

If added, should probably remove the alpha comment after conversion.

[rmaksim]

This issue is still relevant?

[rmaksim]

fixed in acfc441