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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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chatGPZ
Registered: Dec 2001
Posts: 11350 |
cool! just a little bit too late for VICE3.0 - but hey, smart people use the nightlies anyway :=) can't wait for your article, i am curious what exactly has to be changed in VICE :)
edit: please also add PAL/NTSC ... ie the "tuned" sony decoder matrix, it makes a huge difference for NTSC colors :) |
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Moloch
Registered: Jan 2002
Posts: 2924 |
NTSC/PAL would be a great addition |
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Jammer
Registered: Nov 2002
Posts: 1335 |
It surely resembles Lemming's recordings more than before. Good work! :) |
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chatGPZ
Registered: Dec 2001
Posts: 11350 |
btw, iirc VICE currently uses U only for the hanover bars... dont recall why :)
i really like how cranking up the color intensity doesnt make blue red-ish anymore. \o/ |
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MagerValp
Registered: Dec 2001
Posts: 1074 |
Fantastic news, can't wait for the details! |
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Oswald
Registered: Apr 2002
Posts: 5086 |
changing the output while the slider is dragged would be so much better. now its bleehh :P |
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pepto
Account closed
Registered: Nov 2004
Posts: 35 |
@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? |
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ChristopherJam
Registered: Aug 2004
Posts: 1408 |
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: 5086 |
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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