Bit of an odd one, and not something most people would ever come across i guess, but when using RESIZE image it appears that if the alpha is set to zero (which for me it is) then the command drops all the colour data. Resizing an image that is 2048*1024 but converting the memblock holding it into an image, then saving that image works fine. If I add in the resize commend I get a blank image; i.e. all colour data is also gone now.