Crt monitor, what can I expect?

If you take that shot and resize to 1080/1440p level with a lanczos filter, it’s almost the same pattern with lottes 1 (but lottes 1 subpixel RGB is wrong for LCDs, it creates a Magenta Green pattern with an offset, instead of R-G-B so in the end it doesn’t look anywhere near this). Of course you would need a 4K/8K to have all the details.

I’d love to try and recreate those screens in a shader. If you have any time and the desire could you follow the first post here?

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I have a Bang & Olufsen MX8000 preset that might get close but it’s off in terms of colours. I intend to improve this situation with the grade shader and LUTs.

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Here resized to 1440p level (one game pixel is 6x6 on LCD and four 3x3 pixels) with Lanczos. In theory this is the best you can get at 1440

Clipboard02

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Looks like this pattern on a real CRT

And made an attempt here

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I already had a look at it before I took the shots of Sonic here, and fiddled a bit around, but the phone I’m using is simply too old and the camera not good enough to fit the requirements, you can’t expect any better results than what you’re seeing there with different (also easier to photograph) TV. The Telefunken with the Metal Slug shots here makes a poor target anyway because there’s some color derivation between 50/60 modes even with RGB, I need to do more calibration with service mode eventually.

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Fair enough - I was after much closer shots that was mostly all.

The zoom seems useless for this kind of thing on my end, but getting close, this might be better:

Maybe useful for something, maybe not. A bit farther away:

Possibly better Metal Slug shot:

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Yes that close up shot at the top is exactly what I’m after - thanks! Ideally it would be straight on but I’m guessing you might be using an iPhone and it becomes overly bloomy because the ISO is too high. Anyway thanks for doing this the colours in this display are amazing!

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@Jamirus What kind of display is that man? I have no words it looks amazing!

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That’s a standard Telefunken TV (a Thomson Brand) from around 2000 after adjustments with the FOCUS and SCREEN (G2) pots + what you can do with the remote/service mode.

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This is basically a run of the mill slot mask CRT using RGB.

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Looks to be 1-2 triads per scanline (vertically), while the B&O photographed by @MajorPainTheCactus is more like 2-3 triads per scanline.

I’m not sure there’s a way to emulate this lower TVL at 4K using subpixel rendering methods, unfortunately :frowning:

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Vertically wouldnt a 8x6 pattern work? I.e 5 pixels then black and the next column across an alternation of that? I’d be more concerned about the width horizontally (that’s quite possibly what you were talking about). We should try it!

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@Jamirus Damn man i wish i had a crt tv like that insane quality. I’m more of a slot mask guy over aperture grille. I have a Presentation Monitor which is really high quality but man 240p stuff is just way too sharp on that thing for my tastes, i use it only for 480i/480p stuff which is where that thing really shines for me. Here’s a few pics. Curious to know how many inches on that Telefunken TV that you have.

240p RGB

480p RGB

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20" diagonal. “insane quality”? :smile: Ha, this TV was close to being dumped and substituted for another run-of the mill one (nothing out of the ordinary near me), cause I was fed up after seeing the smaller ones I acquired and how much better they are, but after adjusting it’s ok. I did have the opportunity to get one of these


a few months ago, but was thinking it might be somehow out of place in my room. And then I was of course burdend with regret when I was looking again and it wasn’t offered anymore :roll_eyes:

I understand the point about something that should objectively be of higher quality not being to someones liking though . Taste aside, different displays can serve a specific purpose and be more suited for certain content than another.

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Wow never seen a CRT like that before so cool man! To me yes it’s good quality and the overall look that i crave for 240p stuff. In the end it’s all personal preference :+1:

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B&O still alive and hopefully for many more years! gratis nedladdning bilder

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May have something else to show because of a new device I got, but need to do some more testing first. In the meantime, using this thread for interesting/unusual CRT discoveries from the web. Was looking around for some info about early PC monitors, came across this:

VGA monitor with a whopping 0.52 mm dot pitch. As mentioned in the video, for low-res games, this can be sufficient, but working with high-res apps had to be painful. Also note, that this wasn’t a Tandy exclusive, other companies like Packard-Bell advertised similar monitors as shown in the vid.

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Becoming aware of some solutions for the MiSTer made me look around for RGB to - Svideo / composite converters for PC 15 Khz output. I eventually got this:

Tested it first with the PS2. S-Video looks great, difference to RGB is noticable, but nowhere near as large as the jump from composite to RGB. Composite conversion suffers from significant color fringing. I was aware that this is also a problem with the MiSTer options, but I was still surprised how annoying it is, it’s worse than really bad interlace flicker. The real test was with the PC output and the SCART adapter (UMSA) though.

This is where things became interesting, because the results differ wildly depending on the modeline. PAL was especially picky, some of my preset modelines didn’t even show color. I thought at first that it could help to be close to standard NTSC and PAL signals, but it seems it depends on other parameters, as you can also get a decent picture with e.g a 58 Hz refresh. But anyway, eventually I managed to get good enough signals. Here are some composite examples from the AEG set:

Sonic waterfall, Streets of Rage 2 bar, and SMB 1.

The lights of Streets of Rage are the obvious eyecatcher, at one point I also managed to make them almost completely turn into a light red, and in another instance I just had a stripe of rainbow within the usually yellow there.

I also briefly hooked the PS2 up to my USB grabber… Top to bottom: RGB-Svideo, to composite, native composite.

RGB-Svid_1 RGB-CP_1 PS2_CP Native-1

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