Posted: Tue Sep 30, 2008 2:58 pm
Off-Topic again but I love those technical discussions
Btw, I think that what Blaarg's NTSC filters are doing is purely emulating NTSC Video encoder and TV decoder, by doing the RGB<->YIQ transformations and "simulating" artefacts produced by some specific frequencies during the conversions (modern Video encoders probably do a lot more filtering than those old systems)
Apparently, the SNES and Genesis NTSC encoders also differ with the way they are handling the carrier phase: the first one will add an offset on each new field to reduce artefacts where as, in the case of the genesis, it remains constant...
some nice pictures which helped me figuring what NTSC owners were seeing (I always had RGB on my consoles):
http://www.disgruntleddesigner.com/chri ... ml#genesis
and a link I found about NTSC color restriction when dealing with digital graphics:
http://www.gamasutra.com/features/20010 ... son_02.htm
Could it be that this vertical dithering effect (not visible on PAL console btw) is due to the use of "special" color schemes ?
![Cool 8)](./images/smilies/icon_cool.gif)
Btw, I think that what Blaarg's NTSC filters are doing is purely emulating NTSC Video encoder and TV decoder, by doing the RGB<->YIQ transformations and "simulating" artefacts produced by some specific frequencies during the conversions (modern Video encoders probably do a lot more filtering than those old systems)
Apparently, the SNES and Genesis NTSC encoders also differ with the way they are handling the carrier phase: the first one will add an offset on each new field to reduce artefacts where as, in the case of the genesis, it remains constant...
some nice pictures which helped me figuring what NTSC owners were seeing (I always had RGB on my consoles):
http://www.disgruntleddesigner.com/chri ... ml#genesis
and a link I found about NTSC color restriction when dealing with digital graphics:
http://www.gamasutra.com/features/20010 ... son_02.htm
Could it be that this vertical dithering effect (not visible on PAL console btw) is due to the use of "special" color schemes ?