Snes9x.com

I was comparing ZSNES with Snes9x on the matter of the RGB-preset NTSC filter. The graphics generated by Snes9x look not as dark as the ZSNES ones!

I was wondering which program was in its wrong.

Note that the ZSNES RGB filter suffers from a bug by default, which should be remediated through the instructions featured in the following thread: http://board.zsnes.com/phpBB3/viewtopic.php?f=2&t=11775

The comparison between Snes9x and ZSNES should thus be effected only after the bleed setting is set to -100 (which is configuration-file repairable).

Snes9x uses the default blitter implementation provided by blargg with his library, zsnes uses a custom blitter that darkens every second scanline by 25%.

Not that I do not like the graphics as outputted by ZSNES, but is there a reason why it is using such a "custom" blitter instead of the default one?

Otherwise thanks for the info; that fully answers my initial interrogations.

You'll have to ask the zsnes devs about this. The source only states "custom blitter that doubles image height and darkens every other row".

EDIT:
I just remembered that blargg's filters output half-height images, they need to be resized to get correct height. Every second line is darkened to simulate the scanlines look - snes9x (win) uses 12% as in blargg's sample code, zsnes uses 25%.