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FloobJust looking into integer scaling. Would you agree with this?
http://emulation-general.wikia.com/wiki/Scaling
Integer scaling is scaling by a factor of a whole number, so 2x, 3x, 4x, etc. In RetroArch, the option scales the image up to the greatest integer scale below the set resolution. So for instance, if you set your fullscreen resolution to 1920×1080 and enable integer scaling, it will only scale a 320×240 image up to 1280×960, and leave black borders all around.
Just read the monster thread you started here:
http://nintendoage.com/forum/messageview.cfm?catid=31&threadid=135619
To be honest, my conclusion at the moment is that you cant get exactly what a CRT would do, because 1) Many CRTs are different from eachother, and 2) Emulation is a compromise. Therefore whichever solution someone uses, will always be lacking a certain element of the original setup.
Given that scanlines on overlays are a vast improvement over the default output, and I really cant tell much difference, I’m probably going to stick with what I have at the moment.