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Raistlin
Registered: Mar 2007
Posts: 671 |
Screenshots of Interlace Pics
I’m interested to know what people’s thoughts are on screenshotting interlace pics…
On C64GFX, we do things a bit differently to CSDb. Generally, we care more about the original art than how it’s presented - so we’ll host logos with all the “extras” removed (scrollers, textual information, etc). But of course CSDb screenshots are of how things are actually released.
With interlace pics, it’s more complicated. In theory we should be displaying animations at 50fps (usually) switching between 2 screenshots.. but I’m lead to believe that that could cause battery drain and other problems on devices - plus the FPS probably wouldn’t be 50.
Some sort of blending was suggested.. or simply choosing alternate pixels and merging to create a full-res pic.
The latter is what I’ve tried with some pics .. eg. Some of Leon’s. It looks good and it looks like it’s true to the original creation - I’d hazard a guess that he simply drew these pics at full 320x200px resolution on most of these, actually, rather than drawing on C64 in an interlace editor?
Eg. https://c64gfx.com/image/168046
I toyed with the idea of blending the 1px offset pictures (frame 0 and frame 1).. but I’m not sure that that’s correct either.
Others have suggested some fairly complex blending schemes that presumably show more like it would be on CRT - and I think this is where the 1,000s of colours problem comes in (evident on many CSDb screenshots). This seems unfair since regular MC/HI screenshots don’t get the same treatment.
Anyway, interested to know thoughts… both for CSDb and for C64GFX.com |
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CreaMD
Registered: Dec 2001
Posts: 3057 |
I did something similar (mixing of 2 pics) 24 years ago. manually in gfx editor (hence the cropping and different sizes). I made a gallery of party GFX compo pictures in PHP. Entries from every party that I could find were there filterable by year and maybe some other filters. All pics had wrong palette (I liked that one though). The gallery got scrapped by Noname guys for initial CSDB content in all wrong sizes etc ;-). Images got slowly replaced by the correct ones over the years (not sure if all of them, though).
the images are here :-)
http://www.c64.sk/gallery/bopc2/pic/ |
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Jetboy
Registered: Jul 2006
Posts: 329 |
Quoting chatGPZI don't think there is a good solution for this. Not an easy one anyway. You'll either get non synchronised flickering mess - or some super unrealistic blended image.
Could somebody please hold my beer?
http://brombra.net/hold%20my%20beer/index.html |
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CreaMD
Registered: Dec 2001
Posts: 3057 |
🤌🤌🤌 |
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Jetboy
Registered: Jul 2006
Posts: 329 |
i used vice to make screenshots and i'm using those images,colors seems strangely oversaturated to me.
Anyone can experiment by saving index.html and placing 2 images in the same folder naming them s1.png and s2.png then opening the index.html in the browser.
Source is well documented, courtesy of chatgpt.
looks great on all my devices. On desktop it seems there is no flicker at all thanks to 144Hz refresh rate |
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Jetboy
Registered: Jul 2006
Posts: 329 |
correction. it ocassionally stutters on my laptop showing the same frame a couple of times |
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chatGPZ
Registered: Dec 2001
Posts: 11378 |
Goes into unrealistic blended drawer for me - no difference to static blended image here :) |
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Raistlin
Registered: Mar 2007
Posts: 671 |
And again it doesn’t work on my iPhone :-( .. it only
Updates the screen if I scroll/zoom etc. |
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Digger
Registered: Mar 2005
Posts: 432 |
It would be nice to offer the preview mode:
1.) Lace (by using GPU accelerated CSS or JS renderAnimationFrame, e.g. I do toggle a CSS class when you switch "dither" to "lace" https://og2t.github.io/retro-palette-explorer/)
2.) Overlay blending 50/50 |
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Raistlin
Registered: Mar 2007
Posts: 671 |
Quote: It would be nice to offer the preview mode:
1.) Lace (by using GPU accelerated CSS or JS renderAnimationFrame, e.g. I do toggle a CSS class when you switch "dither" to "lace" https://og2t.github.io/retro-palette-explorer/)
2.) Overlay blending 50/50
That looks good! The “preview”‘hover appears over the contain on the main window, though, so I can’t actually click the options underneath on mobile :-(
I’ll try on desktop tonight. |
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Jetboy
Registered: Jul 2006
Posts: 329 |
Quote: And again it doesn’t work on my iPhone :-( .. it only
Updates the screen if I scroll/zoom etc.
11 years is a lot for a phone. It has propper support since ios 7.0
groepaz: it is as close as can be. The biggest difference we have influence on is higher than c64 refresh rate. we can lower it but only by integer factor.
on a 60hz monitor it will be 30hz so still too high for pal c64, but perfect for.ntsc.
on a 72Hz and a factor of 3 it would be 24hz, almost like pal but a little less.
I will add buttons to try different factors when i crawl out of bed.
Then there are factors we have no influence on, like the fact modern monitors have totally different characteristics than crt. We could come up with some ways to circumvent it, but i agree it is not worth the effort.
Plus i think image we used is not the best example. It was first one Raistlin posted. I will grab one of Carron's works next time.
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