GL
GL alpha blending
This patch shows how to use gl objects in Jitter to fade the color of a rendered sphere between two values.
Alphablend a videoplane in OpenGL
A crossfade or blend between two videos is particularly easy to accomplish in Jitter using OpenGL. (One can also blend two videos without GL, using the jit.alphablend object. The GL implementation is more efficient, because the blending computation takes place on the computer's graphics card instead of its CPU.)