Hi again, > This is how it looks in separate luma/chroma: > > http://coroners.no-ip.hu/stuff/P1000756.JPG Yeah, nasty red/green bars every 16 pixels. > And composite: > > http://coroners.no-ip.hu/stuff/P1000757.JPG SHOCK! That is AWFUL! > The machine is a late 6569 based PAL C64 board (maybe 1986) in a flat > box. > I don't currently have a "good" explanation on why the checkboard > patterns trigger colors. There's a 2-line averaging filter (a "comb > filter") in PAL displays, that should average out any and all > colors of > opposite phases. Adjacent rows of a checkboard are perfectly in > "opposite phase". They still trigger colors - which shows that we > don't > (yet) understand something. Hrm, the colour signal from the VIC should be nil nada nothing, so all the colour signal is that filtered luma stuff, right? The luma signal won't be nice steep edges, if you add two lines the signal won't be flat I guess. But dunno :-) The colour signal on the composite is about as strong as you can get! > Consequently, > if color subcarrier was independent, the color artifacts around the > edges would probably just also slowly change their colors with phase > changes. I don't want to imagine it, I get a headache already! Thanks, Segher Message was sent through the cbm-hackers mailing listReceived on 2011-11-19 11:00:22
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