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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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jailbird
Registered: Dec 2001
Posts: 1578 |
Quote: Interesting, I wonder how that happened... thanks for noticing!
I just ripped a fresh copy - you might have to clear your browser-cache if you don't see it immediately.
Maybe the left one was DeeKay's "Why no NUFLI?" alteration from Crest Slide Story? That version butchered my anti-aliasing and was ridden with silly color-clashes :)
Anyhow, you guys are reasoning quite smoothly, so I'm gradually starting to convert, even though the new palette still feels odd... o_O |
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chatGPZ
Registered: Dec 2001
Posts: 11350 |
turn down saturation a bit, that helps a lot to adjust :) |
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LogicDeLuxe
Registered: Jun 2011
Posts: 3 |
Great to see the colors improved.
However, wouldn't a slider instead of a switch make sense for Hanover Bars?
And shouldn't be there a hue slider for NTSC simulation as well? Maybe as a norm switch, which activates either the delay line or the hue slider?
And for further taking different monitor behaviors into account, I guess, gamma sliders for YUV and also for RGB would make sense.
Furthermore, sliders for offset and gain for YUV and RGB. Those advanced settings can be hidden in a "service menu", like it was the case in most CRT TVs since the mid 90's. |
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soci
Registered: Sep 2003
Posts: 479 |
Checked the pictures, nice, also the algorithm, simple enough. But I'm not fully convinced yet ;)
So I'm looking forward to read the promised article with the supporting measurements/traces. Especially the part about the choice of black level and uniform colour saturation. |
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pepto
Account closed
Registered: Nov 2004
Posts: 35 |
Unfortunately I'm far more busy at work right now, than I had planned.
Anyway, I managed to write most stuff down today, so I decided to put it up at http://www.pepto.de/projects/colorvic/ |
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soci
Registered: Sep 2003
Posts: 479 |
I expected some lab equipment involved in this. Things like measurements taken after the decoder in a 1084s and such.
But don't get me wrong, it's still cool ;) |
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chatGPZ
Registered: Dec 2001
Posts: 11350 |
mmmh somehow i expected some more details =) |
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JackAsser
Registered: Jun 2002
Posts: 2014 |
Quote: mmmh somehow i expected some more details =)
Maybe you think it's more complicated than it really is? :D |
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chatGPZ
Registered: Dec 2001
Posts: 11350 |
perhaps =) |
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pepto
Account closed
Registered: Nov 2004
Posts: 35 |
Well, where I come from, simple solutions are actually preferred, as long as they get the job done (see "KISS principle"). :D
I kinda like how little code is needed for a convincing result. In fact, I spent extra time rearranging it, for more clarity.
This means, that more xplat-tools could incorporate brightness, contrast and saturation sliders in the future - in a painless way... \o/ |
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