Hi all, Please excuse this newbie question, but I'm somewhat stuck. I'd like to be able to set the alpha values of particular pixels in a picture somehow. The idea is to have a picture superimposed on top of a video and to be able to change the transparency of individual pixels in the still picture to reveal/conceal the video.

I've looked at pix_set, but this requires a full list of all pixels in the picture. What I would like is to be able to specify the coordinates of a particular pixel and set its RGBA value. Seems like the reverse of pix_data I think.

Perhaps there is a better method for achieving this effect? Any tips appreciated...

Thanks, Andrew