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Forums > CSDb Discussions > colodore is the new pepto
2016-12-12 01:26
pepto

Registered: Nov 2004
Posts: 17
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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2016-12-15 11:28
Oswald

Registered: Apr 2002
Posts: 3990
iirc that picture was converted to nufli, so you might have used the nufli version for the tft.
2016-12-15 18:44
Dr. TerrorZ

Registered: Oct 2013
Posts: 1
In my image, the Imjärvi UFO Incident - BTW I'm honored that it's included :) - for some reason the guy on the left lacks the light brown area on the hat that's in the original, instead it is replaced with dark brown?

Interesting project! I have a 1084S, I'll have to do comparisons.
2016-12-15 19:01
pepto

Registered: Nov 2004
Posts: 17
Quote: In my image, the Imjärvi UFO Incident - BTW I'm honored that it's included :) - for some reason the guy on the left lacks the light brown area on the hat that's in the original, instead it is replaced with dark brown?

Interesting project! I have a 1084S, I'll have to do comparisons.


Sorry, that's a little embarrassing... ^^ I remapped some colors from pre-made screenshots by eye-sight in order to be done faster. This will be a lesson for me to be more careful...

I just fixed it, but you may have to clear your browser-cache just in case you don't see it immediately.

I like the image a lot - the sensation of glowing light in the snowy forrest and the mystery-aspect, I even did research on the real incident because of this... :D
2016-12-15 19:42
Jammer

Registered: Nov 2002
Posts: 615
Quoting Groepaz
just a little bit too late for VICE3.0


That one has drawn my attention. Was that a hint of nice Christmas gift? :P
2016-12-15 20:15
Groepaz

Registered: Dec 2001
Posts: 7840
who knows
2016-12-15 20:19
Oswald

Registered: Apr 2002
Posts: 3990
only now realised there are more pics to be seen in there. played around a bit, and yeah it has a much more CRTish feeling than anything I've seen so far.
2016-12-15 22:02
Jailbird

Registered: Dec 2001
Posts: 1436
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
2016-12-16 01:56
Groepaz

Registered: Dec 2001
Posts: 7840
turn down saturation a bit, that helps a lot to adjust :)
2016-12-23 20:37
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.
2016-12-24 22:35
soci

Registered: Sep 2003
Posts: 305
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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