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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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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: 421 |
@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: 11110 |
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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pepto
Account closed
Registered: Nov 2004
Posts: 35 |
Quote: @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.)
Thanks for your feedback.
I'm not sure I would want it on github. It is open-source already (just view source in your browser) and everyone's invited to implement their own version, if they feel like it. Additionally, I will write a small technical document, about how it basically works, in January.
I think I would hate if other ppl just implemented new features in strange places. I would get lost in my own source-code and also my aim was, to have a clean ui that doesn't get in your way. I'm not sure everyone would respect that, if it's a project on github.
But thanks for the suggestion, I will certainly give it some further thought. |
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Digger
Registered: Mar 2005
Posts: 421 |
@Pepto: If you opensource on github, ppl can only fork it and make their own versions. Then it's always up to you to merge their changes only if:
1) they've specifically sent you a pull request
2) you liked their contributions
But I know that GitHub culture is not very popular amongst C64 scene folk, and that's quite understandable :-)
Looking fwd to your tech doc in Jan. |
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Mr. SID
Registered: Jan 2003
Posts: 421 |
With the default settings, it seems like the white on the webpage is actually #ffffff, but when I save the PNG, white is #fefefe. Any idea why? Screwed by color space, or just a rounding error?
Also, saving to ACT doesn't actually work for me, nothing happens when I click it (Safari, macOS Sierra). |
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pepto
Account closed
Registered: Nov 2004
Posts: 35 |
Quote: With the default settings, it seems like the white on the webpage is actually #ffffff, but when I save the PNG, white is #fefefe. Any idea why? Screwed by color space, or just a rounding error?
Also, saving to ACT doesn't actually work for me, nothing happens when I click it (Safari, macOS Sierra).
Ah, I parseInt() it in the png-writer, maybe I should Math.round() it... i will investigate. I'm running Safari on macOS Mavericks and it works just fine, I'll have to see how I'm able to check what Sierra's problem is. Maybe a suspicious file-suffix? Is there an option to download only "safe" files or something stupid like that? As far as I can see, I'm building it the same way as the png-file -- it doesn't have it's own mime-type like png (image/png) though, it's an "octet-stream"...
Thanks for the feedback! |
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Mr. SID
Registered: Jan 2003
Posts: 421 |
I have no idea, but it doesn't even try to download. Works fine in e.g. Firefox. FWIW, the .act also has #fefefe for white. |
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