In Blitzplus you have to do it 'manually' by writing pixels directly to either the backbuffer or an imagebuffer and calculating the color of the pixels drawn using the color of the pixel 'beneath'. Writepixelfast commands are fine, readpixelfast commands are slow. Using a bank to store the background in is faster. Faster still, if you know that the background image has a lot of sections that are one color, or have sections where the color variation is minor you can do the readpixel/peekbyte function less often by calling it less often which speeds things up.
Image..Transparency
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