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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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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.
t |
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Jetboy
Registered: Jul 2006
Posts: 329 |
I shouldn't be writing when i'm not fully awake... Please disregard previous post as the details are totally misscalculated.
Anyway - here is experiment with different factors.
Images switching every 1,2,3 frames.
http://brombra.net/hold%20my%20beer/index2.html
@gropeaz: I can still see flickering on 60Hz monitor with option 1, but when the refresh rate is greater than that, it is virtually the same for me as superimposed images. |
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Gordian
Registered: May 2022
Posts: 72 |
Test in CSS: https://kawalekkodu.pl/interlace_css.html |
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Shine
Registered: Jul 2012
Posts: 354 |
I like your result. |
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Jetboy
Registered: Jul 2006
Posts: 329 |
Gordian, are you sure blendmode should be soft-light?
What we need to do to superimpose those 2 images is getting average for each pixel. I would do it like that in Affinity Photo, but there is no average blendmode in css...
Notice how displaying alternating frames in my implementation makes the background color of Carrion image blend evenly, as it should, and using your method makes stripes slightly visible. |
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chatGPZ
Registered: Dec 2001
Posts: 11379 |
The animated css version looks most accurate from all posted ones to me |
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Gordian
Registered: May 2022
Posts: 72 |
Quoting JetboyGordian, are you sure blendmode should be soft-light?
Jetboy, this is the only value that works best IMO. |
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Jetboy
Registered: Jul 2006
Posts: 329 |
Quote: Quoting JetboyGordian, are you sure blendmode should be soft-light?
Jetboy, this is the only value that works best IMO.
For the Leon picture it is pretty close indeed, but it needs to work well for all of them. Raistlin blend solution seems to be spot on.
But that css interlace works really well. |
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Raistlin
Registered: Mar 2007
Posts: 671 |
Thanks Gordian - that does look good! It’ll take me a while to try on the site properly but I’ll get there :-) |
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Gordian
Registered: May 2022
Posts: 72 |
And.... Tri-lace: https://kawalekkodu.pl/trilace_css.html
Quoting RaistlinThanks Gordian - that does look good! It’ll take me a while to try on the site properly but I’ll get there :-)
If you need, I can prepare more universal CSS, which takes URL of images from data-* attributes of DIV.lace. Just let me know. |
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