[quote=98163]I tried your scanline overlay but the picture (scanlines) was not show. The overlay only darkened the picture. Could you please upload the two pictures in a .zip file instead, they might have been modified during upload or something?
Are you sure that your video is rendering correctly? The retropie does bilinear filtering when it upscales, which could be causing the scanlines to blur together. Make sure you follow the instructions for getting proper video rendering, which I linked to in the OP.