| |
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 |
|
... 97 posts hidden. Click here to view all posts....
|
| |
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/ |
| |
soci
Registered: Sep 2003
Posts: 473 |
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 ;) |
| |
chatGPZ
Registered: Dec 2001
Posts: 11107 |
mmmh somehow i expected some more details =) |
| |
JackAsser
Registered: Jun 2002
Posts: 1989 |
Quote: mmmh somehow i expected some more details =)
Maybe you think it's more complicated than it really is? :D |
| |
chatGPZ
Registered: Dec 2001
Posts: 11107 |
perhaps =) |
| |
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/ |
| |
pepto
Account closed
Registered: Nov 2004
Posts: 35 |
Quoting LogicDeLuxeAnd 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.
Hmm, I never came across CRTs with Gamma, Offset and Gain dials. I will think about adding "advanced" settings to colodore.com though - thanks for feedback. |
| |
soci
Registered: Sep 2003
Posts: 473 |
Just a few more steps and there will be separate RGB sliders for each colour for maximum flexibility ;) |
| |
chatGPZ
Registered: Dec 2001
Posts: 11107 |
i'd be most interested in seeing the algorithm applied to NTSC (using the sony decoder matrix).....
did a quick test in VICE with the hannover bars stuff as you implemented them.... now everything is pink. knoekicolors =) i think the renderer cant be reused as is and must be rewritten. sux ;_; |
| |
pepto
Account closed
Registered: Nov 2004
Posts: 35 |
Quoting Groepazi'd be most interested in seeing the algorithm applied to NTSC (using the sony decoder matrix).....
If I didn't f*ck it up, like this I guess (only tested in Chrome): http://www.pepto.de/groepaz.html |
| Previous - 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 - Next |
