MAMEWorld Forums - EmuChat - Re: "Dirty pixels" in MAME

> > Non-square pixels (as far as output display) are a thing (partiuclarly for CRT
> based
> > games). Most CRTs are 4:3 aspect ratio but the output resolutions of various arcade
> > games and consoles are not always 4:3, but they are stretched to 4:3 (or there
> > abouts, as CRTs had bezels and overscan so the aspect ratio was always likely a bit
> > different between different CRTs/arcade operators/etc.
> >
> > What you need to turn on is prescale. In addition, a higher resolution monitor also
> > helps. Prescale scales the image up beyond it's original resolution and then scales
> > it back down to your monitor's resolution. It's likely the best you can do for a
> LCD
> > display (again, why a higher resolution display is better - the blurriness is less
> > noticeable).
>
> Turning on prescale did nothing. I'm not sure this has anything to do with pixel
> resizing, because as I've said the pixels are still blurry at 1x1 size with the
> original arcade display.
>
> I sometimes try to rip sprites from games and this situation makes it nearly
> impossible to use mame to do so, since the tile viewer still has dirty pixels and its
> graphics cannot be captured with f12.
>
> As you can see.
>
> This situation was not present in earlier versions of MAME (or at least with other
> people's installations), because the program was routinely used to rip sprites, as
> can be seen here.
>
> I truly believe this can be fixed, I just don't know what setting or file is wrong.

Set prescale somewhere around 3 to 5. It's a multiplier. Start with 3 and move it higher if you want it sharper. The higher the value, the more taxing it is on your graphics card so you can introduce lower performance this way (especially if you're using a lower end/integrated GPU).