ImageRender Render to texture   Example Blend file included

alpha Set/get whether or not the texture alpha channel is being used

background Set/get the background color for the rendered image

capsize Set/get the maximum resolution of the source image

filter Set the image filter

flip Set/get whether or not the image is flipped vertically

image Returns the image data

materialID Returns material ID number

refresh Update the image

scale Activates nearest scaling algorithm

size Returns the source image size