[QUOTE=hunterk;22227]I’m not seeing anything but black lines and transparency here… I’m pretty certain it’s related to the scaling of the overlay, as the gray stuff comes and goes depending on the scale factor with some of the overlays I’ve been fiddling with.
Regardless, you don’t actually need GIMP for that part of it, just for the color-to-alpha part (which is like the one thing GIMP does that Photoshop can’t), and that’s only needed for the MAME RGB effects. If you’re more comfortable in Photoshop, that should be fine for anything other than converting those effects.
I have a couple more you can try. This one doesn’t seem to show any gray and works well at any integer scale factor >2 (as far as I’ve tested; 2x just turns solid gray):
http://i.imgur.com/uICcquEm.png <-EDIT: LOL I just realized how hard it is to download those images. Here they are in a zip instead: https://www.mediafire.com/?8he777fw9atjcub
and here’s what it looks like at 9x:
You’ll notice that it does the fade-out from the black lines, so if you don’t want that, you can try this one, which looks good at any integer scale <6x and is solid black lines:
It actually only blanks out 4/9 (i.e., just under half) of the lines, as I wanted to center the black lines on the pixel borders instead of putting the black lines fully inside the pixel.
You’ll also notice those 2 overlay images are just 1 px wide, as the overlay system will stretch that out to cover the whole horizontal resolution as long as you change the cfg to say ‘overlay0_full_screen = false’ instead of true:
overlays = 1
overlay0_overlay = scanlines.png
overlay0_full_screen = false
overlay0_descs = 0
This can make it a little easier to make scanline effects but obviously doesn’t work for things like phosphor/RGB masks because it’s a stretch rather than a tile effect.[/QUOTE]
Those look good, but I think I’m missing a step. I put the png files in the scanline folder, created a .cfg file for each, made sure they pointed to the right file, and set “overlay0_full_screen = false” on both. When I apply the overlay, all that happens is that the screen gets a lot darker.