Thanks Heron - I'll give it a try. But no there is no gradient. Retrocity - I was creating the light ray effect using the airbrush on a new layer. I've since tried doing it on a solid color layer with much better results. However if I adjust the levels even slightly the bands will show, such as above. But even though I was creating them on a new layer, surely Photoshop is a powerful enough tool to be able to handle the transperancy. Could low computer memory be at fault?