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pepto
Account closed
Registered: Nov 2004
Posts: 35 |
colodore is the new pepto
Hey guys, I remeasured the video-signals of my VIC-II's and slightly updated my 15 year old attempt at calculating an rgb-clone. While at it, I also measured VIC & TED and made a little website about it, that allows you to adjust brightness, contrast and saturation as you like and then save your own custom palette to a png-file.
http://www.colodore.com
I took extra care to make sure, that the brightness, contrast and saturation sliders behave the same way as my 1084s.
While closely comparing my LCD to the 1084s, I found that making the transparency of scanlines dependent on YUV's Y (so they are less visible for brighter colors) looked a lot more like the real thing. I also noticed that the phase-shift on odd-lines happens for YUV's V only and there's even a name for it in video-lingua: hanover bars.
After implementing this, I'm happy to say that the images on my LCD and 1084s are remarkably close.
I will write a more detailed article about it in January, but seriously need a christmas-break first...
Cheers,
pepto |
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ChristopherJam
Registered: Aug 2004
Posts: 1370 |
Good to see you back, pepto!
I too have been doing some video signal measurements. I really need to get my arse into gear about publishing the results of my experiments from back in January; it'll be interesting to compare them to yours. |
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Oswald
Registered: Apr 2002
Posts: 5017 |
Quote: @Oswald: The output changes for me while the slider is dragged, on Chrome, Safari, Firefox, Internet Explorer 9+ and Edge. What browser are you using?
ah now I see, it does change, bout only every 1.5 seconds :D |
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pepto
Account closed
Registered: Nov 2004
Posts: 35 |
Quote: ah now I see, it does change, bout only every 1.5 seconds :D
It does calculate 64000 rgb-values from yuv on each slider-tick in Javascript, which works "pretty fluid" on my 6 year old laptop. 1.5 seconds sounds really lousy though. :-/
Good news is that I plan to port the "yuv to rgb" code to WebGL in the future, which should make things snappy, in case you have some sort of GPU in your machine that is. |
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Oswald
Registered: Apr 2002
Posts: 5017 |
dunno what causes it, this lappy happily runs skyrim otherwise. FF v 50.
ah, much faster in chrome roughly 10 fps. |
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v3to
Registered: Feb 2005
Posts: 150 |
Excellent :) In addition to Moloch, I'd love to see old vic2 lumas too. |
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hedning
Registered: Mar 2009
Posts: 4584 |
Really great! Exactly how the C64 emulation and all screenshots on csdb should be. |
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JackAsser
Registered: Jun 2002
Posts: 1987 |
Quote: Excellent :) In addition to Moloch, I'd love to see old vic2 lumas too.
There is a checkbox in options if you choose VIC-II. |
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v3to
Registered: Feb 2005
Posts: 150 |
@Jackasser: Found :) Thanks |
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Carrion
Registered: Feb 2009
Posts: 317 |
wow
and I'm honoured that my TED pics are used for this.
hopefully it can be implemented in C+4 emulators too.
great job. |
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ptoing
Registered: Sep 2005
Posts: 271 |
Awesome. I would love if you could also input the numbers, not just drag them, as that can be a bit fiddly on slower systems. |
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