Mask 12 has the RRGGBBX layout, so the problem shouldn’t be as with RGB or RRGGBB.
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Now I know what you mean. I achieved that with the deconvergence mode. My crt does magenta green and I wanted to copy that pattern in this setting. My goal is to copy my Sanyo screen. Here an example of my crt…
This is my real Sanyo CRT taken from my mobile camera. Look Rayman’s eyes, it has magenta yellow green colors in the white part of the eyes…
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That makes sense, now. Doubled phosphor width does mitigate the problem somewhat. Same reason why Lottes slot mask works regardless of subpixel type.
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I’m guessing that’s caused by the camera. AFAIK deconvergence never affects the actual individual phosphors on a CRT. Deconvergence results when some phosphors are excited that shouldn’t be due to imprecision in the electron beam, so you get some red or blue phosphors at the edge of objects that are lit up when they shouldn’t be. I bet a sharper photo will reveal that the phosphors are indeed RGB stripes.
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Well certainly the phosphors are RGB. I don’t know if that’s the case why it shows magenta and green on the photo, but it looks similar on bare eyes. But what I know that the pattern looks nearly the same. 
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Maybe too much contrast? Is it calibrated? Just throwing out ideas, now. I’m guessing contrast is set too high because the scanline gaps are nearly invisible, unless that’s a really small set, like less than 14"
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Yes it’s calibrated with 240p test suite… But I’m not an expert on image though…
You mean there’s no scanlines on the real crt or the emulator?
I don’t see them in either, the horizontal lines visible in the photo appear to just be from the slotmask. The gaps will disappear on a CRT if contrast is too high (and you’ll also get a lot of clipping).
Here’s a photo of a 14" slotmask CRT:
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I can see them clearly in the CRT, maybe a bit less in the emulator, but I see them. Scanlines doesn’t look like a trinitron. But as I said I’m not an expert, but what I know is I calibrated the CRT with 240p test suite. Maybe the camera makes it with more contrast.
Here another 2 CRT photos.
See if this helps…
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I’m fairly certain that the lines you’re referring to are just the horizontal lines from the slotmask itself. If you turn down the contrast do the lines become more pronounced? What size screen is this?
The first photo is doing a good job of demonstrating the RGB structure of the slotmask, though. I see no magenta/green pattern, there.
EDIT: Is this a CRT monitor or a TV? And is this an emulator or actual console?
Well I don’t think all tv’s look the same. There are slotmask without any scanlines at all. Mine is a 14" aswell… An is this model Sanyo
No, but even at that size there should be scanline gaps on any slot mask TV. What happens if you turn down the contrast and/or brightness?
The TVL doesn’t appear to be that low, looks to be about the same as the photo I just posted (which has scanline gaps). So it can’t be the TVL.
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Ok. Maybe your right. As I said I can’t confirm that because I’m not an expert. I will give it another check. Maybe I’m doing something wrong. I’ll check 240p test suite again.
By the way, sorry for my ignorance What is clipping?
Before you go and start to recalibrate everything from your CRT to your Super CRT Shader Presets, I would suggest making backups of everything, including your CRT settings because once you start going down this rabbit hole of “fixing” things, the look that you have been able to achieve at this point is almost certain to be lost and to me that would be a travesty.
I would add that a big part of the whole nostalgia factor as well as the CRT look, is from playing games as children on less than perfectly calibrated sets.
If everyone starts to calibrate to the same point, using the same 240p Test Suite, then I can assure you that we will no longer be able to accurately preserve the real experiences that we all used to have.
Based on your presets, I’d say ignorance is bliss! Lol
I don’t let clipping and other things like that bother me if it looks better to my eyes.
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Don’t worry, my settings are saved and I like the way it looks. The CRT I’ve got, I’m used to watch it like that, it was a gift and I never felt something was wrong. For me looks gorgeous. But I never knew these things. But a distance you can’t even notice scanlines. And I never remember at least if you were playing too close like in an arcade. I like the way it looks. But I’m only going to calibrate my CRT. I’ll save settings too. If someone can help me of which is the correct contrast for 240p test suite. So then I’ll post a photo, but I believe my CRT scanlines are not that thick
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The instructions for how to use each of the tests in the 240p Test Suite are contained in the suite itself. Depending on which version of the suite you’re using you have to press different buttons on the controller to access help.
FYI, clipping occurs when you adjust a setting too high for example colour or brightness then it limits the dynamic range so much that you won’t be able to see colours or brightness levels that you otherwise should be able to see or are a part of the signal.
So essentially if you go crazy on settings, the tops or bottoms of the analog sine wave which is how the signal (voltage) is actually represented gets cut off and therefore is lost. The cutoff is also harsh and flat compared to the smooth and gradual rise and fall of the signal and that difference can introduce all sorts of distortion.
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At least if I don’t watch it on an image, I still don’t understand lol. What I know it doesn’t look distorted. I just copied my crt and that helped me
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Well, clipping is undesirable because it means lost detail and desaturated colors. I wouldn’t discourage people from seeking objective improvement to the image quality. A calibrated image just looks so much better, I’m not sure why you would want to discourage people from experiencing that. Once you see it it’s hard to go back. Memories from 30 years ago are completely unreliable as well, so I don’t really think that a calibrated image is necessarily at odds with nostalgia.
@RetroGames4K I’m curious what happens if you lower contrast on the TV. Mostly, I just want to know why that 14" medium TVL set doesn’t have visible scanline gaps. Maybe it has a built in line doubler or something. It’s very strange. Are these photos of actual consoles connected to the TV? Or is it an emulator?
Personally, I really like scanlines. I think they improve the pixel art by allowing your brain to fill in the gaps, creating the perception of a smoother image. The variable beam width also adds a sense of depth, where darker colors appear to recede into the background and brighter colors seem to pop out.
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