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RCA or 35 mm output bad image quality
Posted: Sat May 30, 2015 10:11 am
by hamza
hi
the image or video signal quality of RCA or 35 mm output is too bad ,so, does raspberry pi intrested to develop the quality of this signal??
Re: RCA or 35 mm output bad image quality
Posted: Sat May 30, 2015 10:22 am
by jamesh
The Composite out is done by the SoC so cannot really be changed without a HW change. The 3.5m audio is known to be fairly low quality - thats because of the cheap cost of the board, its not poassible to have a very high quality DAC on board and keep within the price budget.
Re: RCA or 35 mm output bad image quality
Posted: Sat May 30, 2015 10:31 am
by DougieLawson
What do you expect from a 576i display resolution?
It's going to be fuzzy, it's going to have ugly artifacts on desktop objects, that's the nature of analog displays.
Re: RCA or 35 mm output bad image quality
Posted: Sat May 30, 2015 11:46 am
by Burngate
It's not just that there's only 576 lines, or that it's interlaced.
It's also that the colour information is inextricably mixed into the luminance. (That's why s-vhs could be somewhat better - they were kept separate)
For that reason, if the signal-path were to be redesigned so that they came out of the SoC on separate pins, the end result would be better.
Even more improvement could be seen if the R, G, B signals came out seperately. And keeping it all in the digital domain would be perfect.
Oh - hang on - we've already got that!