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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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Mirage
Registered: Jan 2003
Posts: 113 |
Nice to see more progress in this area. Thank you! |
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saimo
Registered: Aug 2009
Posts: 36 |
This is so utterly cool. Many thanks for the great effort, pepto!
Be aware that you just made me spend a whole night remapping *all* the graphics I ever produced (admittedly not much, but some were a real pain) - after, of course, updating the VICE, Personal Paint, and Gimp palettes, and my own custom conversion tools. (I shiver at the thought of when v2 will be out.) |
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pepto
Account closed
Registered: Nov 2004
Posts: 35 |
Thanks for the kind words! :)
It runs completely client-side btw. (even creating the png-files), so BitBreaker - if you want to check boob-compatibility, you could just put any pixels into images.js locally and drag the index.html into your browser-window...
http://www.colodore.com/colodore_v1.zip
Images are just base64 encoded streams of palette indices (4 bits per pixel for VIC and VIC II, 8 bits for TED) in either 160 or 320 pixels width and for 200 lines. |
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STE'86
Registered: Jul 2009
Posts: 274 |
On behalf of all the oldschool artists who have ever crossed swords with the "palette mafia" on here...
"WE TOLD YOU SO!"
sometimes I think there may be a God afterall. |
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MagerValp
Registered: Dec 2001
Posts: 1074 |
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pepto
Account closed
Registered: Nov 2004
Posts: 35 |
Well, you could crank up brightness & contrast and turn off the scanlines and colodore would look a lot more like ste... :) |
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v3to
Registered: Feb 2005
Posts: 150 |
'Fire' by Joe, 'Still Waiting' by Carrion:
left PEPTO
right COLODORE (new vic with 50% saturation)
'Deadlock Loader' by Robin Levy:
top left PEPTO
down left STE'86
top right COLODORE (new vic with 50% saturation)
middle right COLODORE (new vic with 70% saturation)
down right COLODORE (old vic with 70% saturation)
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Digger
Registered: Mar 2005
Posts: 427 |
@Pepto: Superb work! It seems even more accurate than your previous one, especially with luminance order for the "PAL" color pairs. Also quite interesting how you came up with realtime re-calculation on each slider change.
I can now "rip" and update the palette for https://og2t.github.io/retro-palette-explorer/ (that uses your luma values for sorting)
I'd suggest opensourcing Colodore on http://github.com for ppl to contribute features (i.e. download the palette as .act or .json format, display the image 1:1 pixel size etc.) |
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chatGPZ
Registered: Dec 2001
Posts: 11350 |
Quote:Also quite interesting how you came up with realtime re-calculation on each slider change.
that btw was possible in VICE since years.... except in the win32 port :) |
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pepto
Account closed
Registered: Nov 2004
Posts: 35 |
I just added the ability to save palettes as .act files as well. This should help some Photoshop users that had problems handling palettes in png-format, who contacted me via pm.
You may have to refresh your browser-cache to see the new menu-funtion. |
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