Looks very convincing.
3 Likes
Bloom also has a chromatic component, as the base for it is more or less radial gaussian distribution. Mechanisms are implemented that it doesn’t work in a de-saturating manner as it would if left untweaked.
Ofc. if someone likes the old fashioned mask strength without bloom/halation to achieve desired brightness levels on an ordinary display, then it’s also fine.
Although current bloom implementation imo contributes to a somewhat less artificial look resulting from horizontal filtering implementation.
3 Likes
Or, that was intentional. I wanted to start over from a point of perfect convergence because my initial 100% mask strength presets used a sort of random deconvergence that was probably inherited from some older presets I had used as a starting point. I had wondered why the phosphors were all over the place then and wanted something that has the triads properly aligned. Also around that time, @guest.r did a lot of work on deconvergence so I was glad that I didn’t have to rework my presets in order to compensate.
This is where things were before that overhaul:
“This is what you’ll see if you stick your nose up to the screen using my new and improved for 2022 CyberLab Composite - Sharp PVM Edition Shader Preset! Just zoom in and bask in the everglow of those RGB “phosphor” triads!”
In those examples I had tried manually align the phosphors because I wasn’t responsible for how they were before so I didn’t really know if they were where they were supposed to be and these things also affected the colour.
Also, I don’t really understand how deconvergence should be correctly applied from an accuracy perspective so other than a slight nudge here and there because I noticed it improved the colour or contrast in a certain way, I would probably leave it alone for the most part until I know what I’m doing. With that said I do have some presets with deconvergence enabled.
Lastly, my memories of going close to the TV and seeing the RGB Phosphor triads don’t include any memory of deconvergence. Especially to the extent of those examples you just posted. I grew up using a Commodore 1702 Monitor for the most part.
Besides that, those are screenshots not photos taken of the screen using a camera. Those same examples might look a little dirtier if I photographed the screen.
3 Likes
You’ll have more horizontal deconvergence normally than you would vertical. Iirc the red and blue tend to deconverge with each other opposite from the green. (So you turn red and blue to the same value and flip green to the negative or positive version of that value example; R 1.5 B 1.5 G -1.5, I usually set my vertical deconvergence to around half of my horizontal.)
2 Likes
Doesn’t horizontal deconvergence seriously mess with the phosphors?
2 Likes
I thought guest reworked his deconvergence?
Idk man, I just know that horizontal deconvergence was more common on sets.
I’m not trying to filter all my answers based off of whether a shader will break it. (Not trying to be pissy 
)
3 Likes
It’s usually applied before ‘phosphors’, so it shouldn’t. 
5 Likes
Here are some dirtier examples from some of my presets that do employ a little deconvergence @MajorPainTheCactus. As @Nesguy had pointed out, there are some issues with the alignment of the mask. This is probably caused by the scaled down nature of the overlay which I’m trying to fit while the mask isn’t scaling linearly with the viewport. Using the next mask size down would lose the look I was going for with clearly visible RGB triads on my particular 4K screen at low TVL.
Be sure to click on the images and click “Load Full Resolution” if you want to experience what I’m really trying to convey with these screenshots!
1 Like
Can’t you just use an 8K mask at 4K for a lower TVL without scaling the mask? Scaling the mask should really be avoided IMO, particularly with the Megatron shader- it just won’t work as intended otherwise.
RRGGBBX should be just above 300 TVL at 4K, I think that’s what you’re aiming for?
2 Likes
None of those examples were from Megatron. Those are from my shader preset pack which use HSM MegaBezel with CRT-GUEST-ADVANCE shaders.
I was just attempting to get my presets to shoehorn into @soqueroeu’s TV Backgrounds, which I really found added something pleasant to the overall emulation experience.
It proved quite challenging to maintain distinct triads as well as mask strength, scanline strength while avoiding moire and trying to nudge the viewport and bezel to fit each other properly with the right amount of overscan.
Many times Integer Scale didn’t quite fit right and non-integer scale introduced more moire. I don’t think it was the scaling method itself though, just the actual size that I was allowed to scale the image down to. The other challenge I gave myself was trying to use different levels of curvature for the bezel and the viewport.
I haven’t touched that in a while though. PC Engine has been proving to be one of the most challenging of systems to get right due to it’s ability to use quite a wide range of resolutions. In many ways that system was way ahead of its time!
3 Likes
I think these are “done.” All are at 100% mask strength. The 360 TVL Aperture Grille is as bright as I can get it after messing with it for a couple days.
All have been tested at 1080p using 5x vertical scale, I don’t know what will happen at other scales/resolutions.
1 - 360 TVL Aperture Grille 2 - 540 TVL Aperture Grille 3 - 540 TVL Dot Mask
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SamplerLUT2 = "shaders_slang/crt/shaders/guest/advanced/lut/inv-trinitron-lut.png"
SamplerLUT2_linear = "true"
SamplerLUT2_wrap_mode = "clamp_to_border"
SamplerLUT2_mipmap = "false"
SamplerLUT3 = "shaders_slang/crt/shaders/guest/advanced/lut/nec-lut.png"
SamplerLUT3_linear = "true"
SamplerLUT3_wrap_mode = "clamp_to_border"
SamplerLUT3_mipmap = "false"
SamplerLUT4 = "shaders_slang/crt/shaders/guest/advanced/lut/ntsc-lut.png"
SamplerLUT4_linear = "true"
SamplerLUT4_wrap_mode = "clamp_to_border"
SamplerLUT4_mipmap = "false"
3 Likes
Currently only RGB and RGBX, consequently RRGGBB and RRGGBBXX…
2 Likes
Great, hopefully we should get them in @HyperspaceMadness Mega Bezel Reflection Shader soon!
I’m not in front of the computer so I can’t say exactly what size viewport I’m using now but my settings are based on these settings here. My RetroArch is setup as per the HSM Mega Bezel Reflection Shader setup instructions.
I customized my viewport scaling in order to fit the different consoles’ bezels that I have included in my preset pack as well as to cater for the range of resolutions that each individual console uses.
I was trying to get a compromise that would set an appropriate level of overscan for all games on each system so that the preset would work more like a TV (so no cropping per game and stuff like that.)
2 Likes
RRGGBBX is a really good option to have at 4K or 8K, the triad shape is more accurate and the TVL is higher - 308 vs 270 at 4K, I think it’s a noticeable difference. 270 is a bit too low for pixel art IMO.
2 Likes
I belive that RRGGBB also looks nice with 4k since it does mitigate some subpixel ‘banding’. You can also have RRBBGG… RRGGBBX would require a new mask setup, but it’s a viable candidate i guess.
3 Likes
Curious what you think of this.
Can the 360 TVL aperture grille get much brighter without compromising on the mask or colors?
2 Likes
It looks very nice, with HDR colorspace/saturation could need a tweak.
I wouldn’t add too much more simple brightness corrections though as details might get washed out.
Maybe adding a notch of mask strength would make it an appealing ordinary display preset.
2 Likes
In my experience with my PVM’s horizontal deconvergence is easier to fix than vertical deconvergence but that might just be my CRT’s - the next CRT could be totally opposite suppose.
1 Like
No it shouldnt do - with the Megatron and my PVM’s its smooth a motion across the phosphors. You can break taht though with the Megatron by setting any of the horizontal sharpness values below 1. You’ll see popping of phosphors then when you play about with the horizontal deconvergence.
2 Likes