PlainOldPants's Shader Presets

[PlainOldPants]

Let’s hope this fixes it. https://www.mediafire.com/file/wd4sk2ogvx1tgrw/p68k-fast-multipass-2025-11-07.zip/file

One part of the new CRT emulation code was modifying a mat3 like an array of 3 vec3s in column-major order. I’ve changed it to modify each individual float separately. I’m not 100% expecting this to work, but it’s worth a try.

---

Edit:

@PlainOldPants

Because of things like glow and luminance weights, I can’t do a split prepend/append setup to defer the HDR color fix to the end.

I thought I might clear this up. What I’m doing right now is still a compromise. What this prepend/append setup does is pass the CRT’s native RGB with a D65 white balance into the CRT shader, and then correct into any HDR (more precisely, wide gamut) color space in the final appended pass. The results depend on what CRT shader you pick, but in general, this means we’re preferring better individual RGB phosphor sizes, with some expense in scanline thickness and glow levels.

@PlainOldPants

I could do this and make it more efficient, but that effect was more of an eye candy, not as accurate as I would like today. I have just a bit of a hunch on how to improve it, but I don’t have 100% of the information that’s needed for accuracy with it.

This brings me back to my “hunch” up here. For context, this earlier post was about simulating an effect where overdriven electron guns cause colors to bleed to the right.

The White Color of Television Receivers

This is a paper that I came across while aimlessly searching the web. I don’t remember what I was trying to do or how exactly I found it.

My interpretation here is that a pure D65 white doesn’t have all 3 phosphors at the same size, and that the maximum scanline thickness is different for each primary. I don’t know for certain whether current CRT shaders account for this or not, but I’m inclined to assume they all skip this. They might be accounting for individual RGB luminance weights somehow, or they might not be. I’ll need to check the code. This seriously matters for how I’ll go about combining my video signal shaders with other CRT shaders, or how I’ll possibly make my own CRT shader if it comes to that.

These different current ratios also determine how bright each primary can get before bleeding to the right. That’s the “hunch” that I had earlier. The problem is that I don’t have data for this for any of these CRTs. The best guess I have right now is the numbers from this paper which don’t have any citation.

“Ref 7” took me forever to find, and when I did find it on some obscure italian file sharing website, it turned out to be mostly useless, except for knowing that greens with a higher x-coordinate have higher brightness for the same amount of current. Here’s the link, if anyone is curious: https://it.annas-archive.org/md5/697568291741cabaf722948f4c80da25

https://www.youtube.com/watch?v=SfFi7_oykzY

[Nesguy]

This time I used the “ntsc-colors-crt” preset, same result:

Super-Mario-Bros-JU-PRG-0-251108-113734 hosted at ImgBB

shaders = "15"
feedback_pass = "0"
shader0 = "shaders_slang/p68k-fast-multipass-2025-11-07/p68k-fast-mp-pre-color-only.slang"
alias0 = ""
wrap_mode0 = "clamp_to_border"
mipmap_input0 = "false"
filter_linear0 = "false"
frame_count_mod0 = "2"
float_framebuffer0 = "true"
srgb_framebuffer0 = "false"
scale_type_x0 = "source"
scale_x0 = "1.000000"
scale_type_y0 = "source"
scale_y0 = "1.000000"
shader1 = "shaders_slang/p68k-fast-multipass-2025-11-07/p68k-fast-mp-post-color-only.slang"
alias1 = ""
wrap_mode1 = "clamp_to_border"
mipmap_input1 = "false"
filter_linear1 = "false"
frame_count_mod1 = "2"
float_framebuffer1 = "true"
srgb_framebuffer1 = "false"
scale_type_x1 = "source"
scale_x1 = "1.000000"
scale_type_y1 = "source"
scale_y1 = "1.000000"
shader2 = "shaders_slang/crt/shaders/guest/advanced/stock.slang"
alias2 = ""
wrap_mode2 = "clamp_to_border"
mipmap_input2 = "false"
filter_linear2 = "false"
float_framebuffer2 = "false"
srgb_framebuffer2 = "false"
scale_type_x2 = "source"
scale_x2 = "1.000000"
scale_type_y2 = "source"
scale_y2 = "1.000000"
shader3 = "shaders_slang/crt/shaders/guest/advanced/stock.slang"
alias3 = "StockPass"
wrap_mode3 = "clamp_to_border"
mipmap_input3 = "false"
filter_linear3 = "false"
float_framebuffer3 = "false"
srgb_framebuffer3 = "false"
scale_type_x3 = "source"
scale_x3 = "1.000000"
scale_type_y3 = "source"
scale_y3 = "1.000000"
shader4 = "shaders_slang/crt/shaders/guest/advanced/afterglow0.slang"
alias4 = "AfterglowPass"
wrap_mode4 = "clamp_to_border"
mipmap_input4 = "false"
filter_linear4 = "false"
float_framebuffer4 = "false"
srgb_framebuffer4 = "false"
scale_type_x4 = "source"
scale_x4 = "1.000000"
scale_type_y4 = "source"
scale_y4 = "1.000000"
shader5 = "shaders_slang/crt/shaders/guest/advanced/pre-shaders-afterglow.slang"
alias5 = "PrePass"
wrap_mode5 = "clamp_to_border"
mipmap_input5 = "true"
filter_linear5 = "false"
float_framebuffer5 = "false"
srgb_framebuffer5 = "false"
scale_type_x5 = "source"
scale_x5 = "1.000000"
scale_type_y5 = "source"
scale_y5 = "1.000000"
shader6 = "shaders_slang/crt/shaders/guest/advanced/avg-lum.slang"
alias6 = "AvgLumPass"
wrap_mode6 = "clamp_to_border"
mipmap_input6 = "true"
filter_linear6 = "true"
float_framebuffer6 = "false"
srgb_framebuffer6 = "false"
scale_type_x6 = "source"
scale_x6 = "1.000000"
scale_type_y6 = "source"
scale_y6 = "1.000000"
shader7 = "shaders_slang/crt/shaders/guest/advanced/linearize.slang"
alias7 = "LinearizePass"
wrap_mode7 = "clamp_to_border"
mipmap_input7 = "false"
filter_linear7 = "true"
float_framebuffer7 = "true"
srgb_framebuffer7 = "false"
scale_type_x7 = "source"
scale_x7 = "1.000000"
scale_type_y7 = "source"
scale_y7 = "1.000000"
shader8 = "shaders_slang/crt/shaders/guest/advanced/gaussian_horizontal.slang"
alias8 = ""
wrap_mode8 = "clamp_to_border"
mipmap_input8 = "false"
filter_linear8 = "true"
float_framebuffer8 = "true"
srgb_framebuffer8 = "false"
scale_type_x8 = "absolute"
scale_x8 = "800"
scale_type_y8 = "source"
scale_y8 = "1.000000"
shader9 = "shaders_slang/crt/shaders/guest/advanced/gaussian_vertical.slang"
alias9 = "GlowPass"
wrap_mode9 = "clamp_to_border"
mipmap_input9 = "false"
filter_linear9 = "true"
float_framebuffer9 = "true"
srgb_framebuffer9 = "false"
scale_type_x9 = "absolute"
scale_x9 = "800"
scale_type_y9 = "absolute"
scale_y9 = "600"
shader10 = "shaders_slang/crt/shaders/guest/advanced/bloom_horizontal.slang"
alias10 = ""
wrap_mode10 = "clamp_to_border"
mipmap_input10 = "false"
filter_linear10 = "true"
float_framebuffer10 = "true"
srgb_framebuffer10 = "false"
scale_type_x10 = "absolute"
scale_x10 = "800"
scale_type_y10 = "absolute"
scale_y10 = "600"
shader11 = "shaders_slang/crt/shaders/guest/advanced/bloom_vertical.slang"
alias11 = "BloomPass"
wrap_mode11 = "clamp_to_border"
mipmap_input11 = "false"
filter_linear11 = "true"
float_framebuffer11 = "true"
srgb_framebuffer11 = "false"
scale_type_x11 = "source"
scale_x11 = "1.000000"
scale_type_y11 = "source"
scale_y11 = "1.000000"
shader12 = "shaders_slang/crt/shaders/guest/advanced/crt-guest-advanced.slang"
alias12 = ""
wrap_mode12 = "clamp_to_border"
mipmap_input12 = "false"
filter_linear12 = "true"
float_framebuffer12 = "true"
srgb_framebuffer12 = "false"
scale_type_x12 = "viewport"
scale_x12 = "1.000000"
scale_type_y12 = "viewport"
scale_y12 = "1.000000"
shader13 = "shaders_slang/crt/shaders/guest/advanced/deconvergence.slang"
alias13 = ""
wrap_mode13 = "clamp_to_border"
mipmap_input13 = "false"
filter_linear13 = "true"
float_framebuffer13 = "false"
srgb_framebuffer13 = "false"
scale_type_x13 = "viewport"
scale_x13 = "1.000000"
scale_type_y13 = "viewport"
scale_y13 = "1.000000"
shader14 = "shaders_slang/p68k-fast-multipass-2025-11-07/p68k-fast-mp-append-hdr.slang"
alias14 = ""
wrap_mode14 = "clamp_to_border"
mipmap_input14 = "false"
filter_linear14 = "false"
frame_count_mod14 = "2"
float_framebuffer14 = "true"
srgb_framebuffer14 = "false"
scale_type_x14 = "source"
scale_x14 = "1.000000"
scale_type_y14 = "source"
scale_y14 = "1.000000"
pf_hdr_enable = "2.000000"
textures = "SamplerLUT1;SamplerLUT2;SamplerLUT3;SamplerLUT4"
SamplerLUT1 = "shaders_slang/crt/shaders/guest/advanced/lut/trinitron-lut.png"
SamplerLUT1_mipmap = "false"
SamplerLUT1_wrap_mode = "clamp_to_border"
SamplerLUT2 = "shaders_slang/crt/shaders/guest/advanced/lut/inv-trinitron-lut.png"
SamplerLUT2_mipmap = "false"
SamplerLUT2_wrap_mode = "clamp_to_border"
SamplerLUT3 = "shaders_slang/crt/shaders/guest/advanced/lut/nec-lut.png"
SamplerLUT3_mipmap = "false"
SamplerLUT3_wrap_mode = "clamp_to_border"
SamplerLUT4 = "shaders_slang/crt/shaders/guest/advanced/lut/ntsc-lut.png"
SamplerLUT4_mipmap = "false"
SamplerLUT4_wrap_mode = "clamp_to_border"

[anikom15]

There are some aspects of CRTs where things just fall together and still work despite apparent nonlinearities like this.

It’s true that the spot size ends up different for different colors, macro photographs verify it. But then somehow it all comes together and the colors still converge nicely and have a fairly linear response. People can adjust the color temperature and even the spot size and it somehow doesn’t result in convergence issues or gamma imbalance.

[PlainOldPants]

My concern here isn’t about convergence or gamma inbalance. It’s about the scanline thickness, the expanding size of individual phosphors, and glow/afterglow, all of which are things that CRT shaders do deliberately. I want to make sure that my signal and color effects are able to make sense when combined with a full CRT effect.

(Another thing is with color bleeding, when the settings for contrast and color are set too high for the CRT to handle, but that’s more of an “eye candy” effect that doesn’t need to be accurate and isn’t going to be used by anyone for more than maybe 10 minutes.)

Am I not understanding your post correctly?

[anikom15]

I’m not sure. You are geting into complicated territory where things stop being able to be described with math. Empirically, we would expect to see red fringing around pure white scanlines. If we can’t see that, it doesn’t mean the effect doesn’t exist, but it could be too insignificant to have a visible effect or be compensated by some other mechanism. Chromatic aberration makes it difficult to measure this.

[Jobima]

@PlainOldPants

I have just a bit of a hunch on how to improve it, but I don’t have 100% of the information that’s needed for accuracy with it.

what kind of information is needed?

anyway, there are https://www.reddit.com/r/crtgaming/comments/1lrv725/does_anyone_know_why_red_and_blue_usually_color/

here some images

also I remember it was randomly moving (change size), and as said in the comments of reddit link, it kinda happen more in red and less in blue and very less in green

[PlainOldPants]

@Jobima

what kind of information is needed?

A big part is this information from up here:

@PlainOldPants

These different current ratios also determine how bright each primary can get before bleeding to the right. That’s the “hunch” that I had earlier.

That explains this:

@Jobima

it kinda happen more in red and less in blue and very less in green

That’s kind of the “easy” part. The hard part is understanding how the bleed actually works at a hardware level. My current best guess is that the bleed to the right is just whatever amount of voltage/current went over the maximum limit.

@Jobima

also I remember it was randomly moving (change size), and as said in the comments of reddit link

I haven’t read the comments, but I’m inclined to believe that this is caused by even slight amounts of RF noise.

About the images which you’ve shared, those make it hard to tell the difference between chroma lowpass/bandpass and actual bright red/blue bleed. Both affect red and blue more than green. The former is normal and is already being partly emulated by FIR filters (“partly” because I believe a “complete” implementation should be more similar to the inductor/capacitor filters on real hardware which delayed things to the right). As for the red/blue high voltage/current bleed effect, that’s caused by an entirely different kind of electrical component, and it only happens if contrast is set insanely high (often due to wear, aging, or the end user not knowing any better). These images don’t look applicable.

Here are some links I just copied from an older post of mine.

https://www.reddit.com/r/crtgaming/comments/ihes5m/does_this_color_issue_mean_my_crt_is_going_out/ https://web.archive.org/web/20220826091650/https://i.imgur.com/At0tRng.jpg 2 https://www.reddit.com/r/explainlikeimfive/comments/7xk1ll/eli5_why_do_some_crt_tvs_have_color_bleed/

[Jobima]

@PlainOldPants

About the images which you’ve shared, those make it hard to tell the difference between chroma lowpass/bandpass and actual bright red/blue bleed. Both affect red and blue more than green. The former is normal and is already being partly emulated by FIR filters (“partly” because I believe a “complete” implementation should be more similar to the inductor/capacitor filters on real hardware which delayed things to the right).

even in S-video? the 3rd image was S-video

anyway, from your reddit 1st link, I saw only one TV that do this back in our home, which was a bad TV

what about https://www.reddit.com/r/crtgaming/comments/1lrv725/does_anyone_know_why_red_and_blue_usually_color/ ? so is it RF noise? or difference between chroma lowpass/bandpass?

anyway, seems the images you share is not what I need, so what I need is “chroma RF noise” or “difference between chroma lowpass/bandpass”?

[anikom15]

S-Video uses chroma filters like composite and RF. One way to confirm it’s an overdriven gun is if you still get the bleed for RGB/component.

[Jobima]

@anikom15

One way to confirm it’s an overdriven gun is if you still get the bleed for RGB/component.

seems its “chroma filters/rf noise”

https://x.com/CRTpixels/status/1372635045740036097

I think case closed?

so it need to be added in PAL/NTSC shaders @guest.r ?

[PlainOldPants]

About the RF noise, I just meant that slight RF noise would cause the bleed to randomly change size. RF noise itself doesn’t cause the bleed. It just causes it to befome shaky.

[Jobima]

@PlainOldPants

RF noise itself doesn’t cause the bleed.

I was also considering that possibility

[PlainOldPants]

@anikom15

One way to confirm it’s an overdriven gun is if you still get the bleed for RGB/component.

True, but it’s worth mentioning that most CRTs oversaturate red a lot when playing video games over composite or RF, which causes the electron gun bleed to increase compared to RGB or YPbPr component.

[PlainOldPants]

@PlainOldPants

The former is normal and is already being partly emulated by FIR filters (“partly” because I believe a “complete” implementation should be more similar to the inductor/capacitor filters on real hardware which delayed things to the right).

About the chroma lowpass/bandpass which NTSC shaders already kind of do, the “right way” to do them is to simulate the lowpass/bandpass that’s found in the schematics of the actual console and CRT. That’s how to get that blur to go to the right instead of symmetrical. There must be some way to simulate this quickly and efficiently, but I haven’t tried yet myself.

As said before, the electron gun bleed is different.

[Jobima]

@PlainOldPants

it’s worth mentioning that most CRTs oversaturate red a lot when playing video games over composite or RF, which causes the electron gun bleed to increase compared to RGB or YPbPr component.

so it mixed of both, classic analog

One of the reasons I wrote this is not just to simulate/emulate faulty CRT monitors, but because I know that even working monitors have these effects, albeit to a lesser extent. Therefore, I believe they are necessary to achieve the authentic experience, of course in small and reasonable proportions that don’t negatively affect the image

[anikom15]

@PlainOldPants

That’s how to get that blur to go to the right instead of symmetrical. There must be some way to simulate this quickly and efficiently, but I haven’t tried yet myself.

You just need to use an IIR filter as opposed to an FIR filter.

[Nesguy]

Recent test:

Added Grade, CRT Contrast +60%

(Color) Saturation 1.20

I think this is good but I don’t know why I have to do things to Saturation and Contrast- the difficulty here is that I’m not sure what’s expected.

Super-Mario-Bros-JU-PRG-0-251111-143358 hosted at ImgBB

shaders = "21"
feedback_pass = "0"
shader0 = "shaders_slang/p68k-fast-multipass-2025-11-07/p68k-fast-mp-pre-color-only.slang"
alias0 = ""
wrap_mode0 = "clamp_to_border"
mipmap_input0 = "false"
filter_linear0 = "false"
frame_count_mod0 = "2"
float_framebuffer0 = "true"
srgb_framebuffer0 = "false"
scale_type_x0 = "source"
scale_x0 = "1.000000"
scale_type_y0 = "source"
scale_y0 = "1.000000"
shader1 = "shaders_slang/p68k-fast-multipass-2025-11-07/p68k-fast-mp-post-color-only.slang"
alias1 = ""
wrap_mode1 = "clamp_to_border"
mipmap_input1 = "false"
filter_linear1 = "false"
frame_count_mod1 = "2"
float_framebuffer1 = "true"
srgb_framebuffer1 = "false"
scale_type_x1 = "source"
scale_x1 = "1.000000"
scale_type_y1 = "source"
scale_y1 = "1.000000"
shader2 = "shaders_slang/misc/shaders/grade-no-LUT.slang"
alias2 = ""
wrap_mode2 = "clamp_to_border"
mipmap_input2 = "false"
float_framebuffer2 = "false"
srgb_framebuffer2 = "false"
scale_type_x2 = "viewport"
scale_x2 = "1.000000"
scale_type_y2 = "viewport"
scale_y2 = "1.000000"
shader3 = "shaders_slang/crt/shaders/guest/advanced/stock.slang"
alias3 = ""
wrap_mode3 = "clamp_to_border"
mipmap_input3 = "false"
filter_linear3 = "false"
float_framebuffer3 = "false"
srgb_framebuffer3 = "false"
scale_type_x3 = "source"
scale_x3 = "1.000000"
scale_type_y3 = "source"
scale_y3 = "1.000000"
shader4 = "shaders_slang/crt/shaders/guest/advanced/stock.slang"
alias4 = "StockPass"
wrap_mode4 = "clamp_to_border"
mipmap_input4 = "false"
filter_linear4 = "false"
float_framebuffer4 = "false"
srgb_framebuffer4 = "false"
scale_type_x4 = "source"
scale_x4 = "1.000000"
scale_type_y4 = "source"
scale_y4 = "1.000000"
shader5 = "shaders_slang/crt/shaders/guest/advanced/afterglow0.slang"
alias5 = "AfterglowPass"
wrap_mode5 = "clamp_to_border"
mipmap_input5 = "false"
filter_linear5 = "true"
float_framebuffer5 = "false"
srgb_framebuffer5 = "false"
scale_type_x5 = "source"
scale_x5 = "1.000000"
scale_type_y5 = "source"
scale_y5 = "1.000000"
shader6 = "shaders_slang/crt/shaders/guest/advanced/pre-shaders-afterglow.slang"
alias6 = "PrePass0"
wrap_mode6 = "clamp_to_border"
mipmap_input6 = "false"
filter_linear6 = "true"
float_framebuffer6 = "false"
srgb_framebuffer6 = "false"
scale_type_x6 = "source"
scale_x6 = "1.000000"
scale_type_y6 = "source"
scale_y6 = "1.000000"
shader7 = "shaders_slang/crt/shaders/guest/advanced/ntsc/ntsc-pass1.slang"
alias7 = "NPass1"
wrap_mode7 = "clamp_to_border"
mipmap_input7 = "false"
filter_linear7 = "false"
float_framebuffer7 = "true"
srgb_framebuffer7 = "false"
scale_type_x7 = "source"
scale_x7 = "4.000000"
scale_type_y7 = "source"
scale_y7 = "1.000000"
shader8 = "shaders_slang/crt/shaders/guest/advanced/ntsc/ntsc-pass2.slang"
alias8 = ""
wrap_mode8 = "clamp_to_border"
mipmap_input8 = "false"
filter_linear8 = "true"
float_framebuffer8 = "true"
srgb_framebuffer8 = "false"
scale_type_x8 = "source"
scale_x8 = "0.500000"
scale_type_y8 = "source"
scale_y8 = "1.000000"
shader9 = "shaders_slang/crt/shaders/guest/advanced/ntsc/ntsc-pass3.slang"
alias9 = ""
wrap_mode9 = "clamp_to_border"
mipmap_input9 = "false"
filter_linear9 = "true"
float_framebuffer9 = "false"
srgb_framebuffer9 = "false"
scale_type_x9 = "source"
scale_x9 = "1.000000"
scale_type_y9 = "source"
scale_y9 = "1.000000"
shader10 = "shaders_slang/crt/shaders/guest/advanced/custom-fast-sharpen.slang"
alias10 = "NtscPass"
wrap_mode10 = "clamp_to_border"
mipmap_input10 = "false"
filter_linear10 = "true"
float_framebuffer10 = "false"
srgb_framebuffer10 = "false"
scale_type_x10 = "source"
scale_x10 = "1.000000"
scale_type_y10 = "source"
scale_y10 = "1.000000"
shader11 = "shaders_slang/crt/shaders/guest/advanced/stock.slang"
alias11 = "PrePass"
wrap_mode11 = "clamp_to_border"
mipmap_input11 = "true"
filter_linear11 = "true"
float_framebuffer11 = "false"
srgb_framebuffer11 = "false"
scale_type_x11 = "source"
scale_x11 = "1.000000"
scale_type_y11 = "source"
scale_y11 = "1.000000"
shader12 = "shaders_slang/crt/shaders/guest/advanced/avg-lum-ntsc.slang"
alias12 = "AvgLumPass"
wrap_mode12 = "clamp_to_border"
mipmap_input12 = "true"
filter_linear12 = "true"
float_framebuffer12 = "false"
srgb_framebuffer12 = "false"
scale_type_x12 = "source"
scale_x12 = "1.000000"
scale_type_y12 = "source"
scale_y12 = "1.000000"
shader13 = "shaders_slang/crt/shaders/guest/advanced/linearize-ntsc.slang"
alias13 = "LinearizePass"
wrap_mode13 = "clamp_to_border"
mipmap_input13 = "false"
filter_linear13 = "true"
float_framebuffer13 = "true"
srgb_framebuffer13 = "false"
scale_type_x13 = "source"
scale_x13 = "1.000000"
scale_type_y13 = "source"
scale_y13 = "1.000000"
shader14 = "shaders_slang/crt/shaders/guest/advanced/crt-guest-advanced-ntsc-pass1.slang"
alias14 = "Pass1"
wrap_mode14 = "clamp_to_border"
mipmap_input14 = "false"
filter_linear14 = "true"
float_framebuffer14 = "true"
srgb_framebuffer14 = "false"
scale_type_x14 = "viewport"
scale_x14 = "1.000000"
scale_type_y14 = "source"
scale_y14 = "1.000000"
shader15 = "shaders_slang/crt/shaders/guest/hd/gaussian_horizontal.slang"
alias15 = ""
wrap_mode15 = "clamp_to_border"
mipmap_input15 = "false"
filter_linear15 = "true"
float_framebuffer15 = "true"
srgb_framebuffer15 = "false"
scale_type_x15 = "absolute"
scale_x15 = "800"
scale_type_y15 = "source"
scale_y15 = "1.000000"
shader16 = "shaders_slang/crt/shaders/guest/advanced/gaussian_vertical.slang"
alias16 = "GlowPass"
wrap_mode16 = "clamp_to_border"
mipmap_input16 = "false"
filter_linear16 = "true"
float_framebuffer16 = "true"
srgb_framebuffer16 = "false"
scale_type_x16 = "absolute"
scale_x16 = "800"
scale_type_y16 = "absolute"
scale_y16 = "600"
shader17 = "shaders_slang/crt/shaders/guest/hd/bloom_horizontal.slang"
alias17 = ""
wrap_mode17 = "clamp_to_border"
mipmap_input17 = "false"
filter_linear17 = "true"
float_framebuffer17 = "true"
srgb_framebuffer17 = "false"
scale_type_x17 = "absolute"
scale_x17 = "800"
scale_type_y17 = "absolute"
scale_y17 = "600"
shader18 = "shaders_slang/crt/shaders/guest/advanced/bloom_vertical.slang"
alias18 = "BloomPass"
wrap_mode18 = "clamp_to_border"
mipmap_input18 = "false"
filter_linear18 = "true"
float_framebuffer18 = "true"
srgb_framebuffer18 = "false"
scale_type_x18 = "absolute"
scale_x18 = "800"
scale_type_y18 = "absolute"
scale_y18 = "600"
shader19 = "shaders_slang/crt/shaders/guest/advanced/crt-guest-advanced-ntsc-pass2.slang"
alias19 = ""
wrap_mode19 = "clamp_to_border"
mipmap_input19 = "false"
filter_linear19 = "true"
float_framebuffer19 = "true"
srgb_framebuffer19 = "false"
scale_type_x19 = "viewport"
scale_x19 = "1.000000"
scale_type_y19 = "viewport"
scale_y19 = "1.000000"
shader20 = "shaders_slang/crt/shaders/guest/advanced/deconvergence-ntsc.slang"
alias20 = ""
wrap_mode20 = "clamp_to_border"
mipmap_input20 = "false"
filter_linear20 = "true"
float_framebuffer20 = "false"
srgb_framebuffer20 = "false"
scale_type_x20 = "viewport"
scale_x20 = "1.000000"
scale_type_y20 = "viewport"
scale_y20 = "1.000000"
pfm_stdApproxGamma = "3.000000"
pf_gamma = "1.999996"
pf_color = "1.200000"
pf_hdr_enable = "2.000000"
g_CRT_l = "2.600000"
g_CRT_c = "80.000000"
wlr = "1.020000"
gr = "0.020000"
br = "0.020000"
cust_artifacting = "0.000000"
cust_fringing = "0.000000"
ntsc_scale = "1.500000"
ntsc_taps = "6.000000"
GAMMA_INPUT = "2.200000"
gamma_out = "2.200000"
m_glow = "2.000000"
glow = "0.020000"
brightboost = "1.000000"
brightboost1 = "1.000000"
gsl = "2.000000"
scanline1 = "5.000000"
scanline2 = "35.000000"
beam_min = "1.200000"
beam_size = "0.000000"
scans = "1.000000"
shadowMask = "12.000000"
maskstr = "0.800000"
mcut = "1.000000"
post_br = "1.500000"
textures = "SamplerLUT1;SamplerLUT2;SamplerLUT3;SamplerLUT4"
SamplerLUT1 = "shaders_slang/crt/shaders/guest/advanced/lut/trinitron-lut.png"
SamplerLUT1_mipmap = "false"
SamplerLUT1_wrap_mode = "clamp_to_border"
SamplerLUT2 = "shaders_slang/crt/shaders/guest/advanced/lut/inv-trinitron-lut.png"
SamplerLUT2_mipmap = "false"
SamplerLUT2_wrap_mode = "clamp_to_border"
SamplerLUT3 = "shaders_slang/crt/shaders/guest/advanced/lut/nec-lut.png"
SamplerLUT3_mipmap = "false"
SamplerLUT3_wrap_mode = "clamp_to_border"
SamplerLUT4 = "shaders_slang/crt/shaders/guest/advanced/lut/ntsc-lut.png"
SamplerLUT4_mipmap = "false"
SamplerLUT4_wrap_mode = "clamp_to_border"

[Nesguy]

And here’s another with no grade, default settings for guest-advanced. I have no idea what changed. Using the version from “p68k-fast-multipass-2025-11-07”

Edit: It seems to be only the ntsc colors preset that’s working, the others all result in the washed out image

Super-Mario-Bros-JU-PRG-0-251111-181401 hosted at ImgBB

shaders = "21"
feedback_pass = "0"
shader0 = "shaders_slang/p68k-fast-multipass-2025-11-07/p68k-fast-mp-pre-color-only.slang"
alias0 = ""
wrap_mode0 = "clamp_to_border"
mipmap_input0 = "false"
filter_linear0 = "false"
frame_count_mod0 = "2"
float_framebuffer0 = "true"
srgb_framebuffer0 = "false"
scale_type_x0 = "source"
scale_x0 = "1.000000"
scale_type_y0 = "source"
scale_y0 = "1.000000"
shader1 = "shaders_slang/p68k-fast-multipass-2025-11-07/p68k-fast-mp-post-color-only.slang"
alias1 = ""
wrap_mode1 = "clamp_to_border"
mipmap_input1 = "false"
filter_linear1 = "false"
frame_count_mod1 = "2"
float_framebuffer1 = "true"
srgb_framebuffer1 = "false"
scale_type_x1 = "source"
scale_x1 = "1.000000"
scale_type_y1 = "source"
scale_y1 = "1.000000"
shader2 = "shaders_slang/stock.slang"
alias2 = ""
wrap_mode2 = "clamp_to_border"
mipmap_input2 = "false"
float_framebuffer2 = "false"
srgb_framebuffer2 = "false"
scale_type_x2 = "viewport"
scale_x2 = "1.000000"
scale_type_y2 = "viewport"
scale_y2 = "1.000000"
shader3 = "shaders_slang/crt/shaders/guest/advanced/stock.slang"
alias3 = ""
wrap_mode3 = "clamp_to_border"
mipmap_input3 = "false"
filter_linear3 = "false"
float_framebuffer3 = "false"
srgb_framebuffer3 = "false"
scale_type_x3 = "source"
scale_x3 = "1.000000"
scale_type_y3 = "source"
scale_y3 = "1.000000"
shader4 = "shaders_slang/crt/shaders/guest/advanced/stock.slang"
alias4 = "StockPass"
wrap_mode4 = "clamp_to_border"
mipmap_input4 = "false"
filter_linear4 = "false"
float_framebuffer4 = "false"
srgb_framebuffer4 = "false"
scale_type_x4 = "source"
scale_x4 = "1.000000"
scale_type_y4 = "source"
scale_y4 = "1.000000"
shader5 = "shaders_slang/crt/shaders/guest/advanced/afterglow0.slang"
alias5 = "AfterglowPass"
wrap_mode5 = "clamp_to_border"
mipmap_input5 = "false"
filter_linear5 = "true"
float_framebuffer5 = "false"
srgb_framebuffer5 = "false"
scale_type_x5 = "source"
scale_x5 = "1.000000"
scale_type_y5 = "source"
scale_y5 = "1.000000"
shader6 = "shaders_slang/crt/shaders/guest/advanced/pre-shaders-afterglow.slang"
alias6 = "PrePass0"
wrap_mode6 = "clamp_to_border"
mipmap_input6 = "false"
filter_linear6 = "true"
float_framebuffer6 = "false"
srgb_framebuffer6 = "false"
scale_type_x6 = "source"
scale_x6 = "1.000000"
scale_type_y6 = "source"
scale_y6 = "1.000000"
shader7 = "shaders_slang/crt/shaders/guest/advanced/ntsc/ntsc-pass1.slang"
alias7 = "NPass1"
wrap_mode7 = "clamp_to_border"
mipmap_input7 = "false"
filter_linear7 = "false"
float_framebuffer7 = "true"
srgb_framebuffer7 = "false"
scale_type_x7 = "source"
scale_x7 = "4.000000"
scale_type_y7 = "source"
scale_y7 = "1.000000"
shader8 = "shaders_slang/crt/shaders/guest/advanced/ntsc/ntsc-pass2.slang"
alias8 = ""
wrap_mode8 = "clamp_to_border"
mipmap_input8 = "false"
filter_linear8 = "true"
float_framebuffer8 = "true"
srgb_framebuffer8 = "false"
scale_type_x8 = "source"
scale_x8 = "0.500000"
scale_type_y8 = "source"
scale_y8 = "1.000000"
shader9 = "shaders_slang/crt/shaders/guest/advanced/ntsc/ntsc-pass3.slang"
alias9 = ""
wrap_mode9 = "clamp_to_border"
mipmap_input9 = "false"
filter_linear9 = "true"
float_framebuffer9 = "false"
srgb_framebuffer9 = "false"
scale_type_x9 = "source"
scale_x9 = "1.000000"
scale_type_y9 = "source"
scale_y9 = "1.000000"
shader10 = "shaders_slang/crt/shaders/guest/advanced/custom-fast-sharpen.slang"
alias10 = "NtscPass"
wrap_mode10 = "clamp_to_border"
mipmap_input10 = "false"
filter_linear10 = "true"
float_framebuffer10 = "false"
srgb_framebuffer10 = "false"
scale_type_x10 = "source"
scale_x10 = "1.000000"
scale_type_y10 = "source"
scale_y10 = "1.000000"
shader11 = "shaders_slang/crt/shaders/guest/advanced/stock.slang"
alias11 = "PrePass"
wrap_mode11 = "clamp_to_border"
mipmap_input11 = "true"
filter_linear11 = "true"
float_framebuffer11 = "false"
srgb_framebuffer11 = "false"
scale_type_x11 = "source"
scale_x11 = "1.000000"
scale_type_y11 = "source"
scale_y11 = "1.000000"
shader12 = "shaders_slang/crt/shaders/guest/advanced/avg-lum-ntsc.slang"
alias12 = "AvgLumPass"
wrap_mode12 = "clamp_to_border"
mipmap_input12 = "true"
filter_linear12 = "true"
float_framebuffer12 = "false"
srgb_framebuffer12 = "false"
scale_type_x12 = "source"
scale_x12 = "1.000000"
scale_type_y12 = "source"
scale_y12 = "1.000000"
shader13 = "shaders_slang/crt/shaders/guest/advanced/linearize-ntsc.slang"
alias13 = "LinearizePass"
wrap_mode13 = "clamp_to_border"
mipmap_input13 = "false"
filter_linear13 = "true"
float_framebuffer13 = "true"
srgb_framebuffer13 = "false"
scale_type_x13 = "source"
scale_x13 = "1.000000"
scale_type_y13 = "source"
scale_y13 = "1.000000"
shader14 = "shaders_slang/crt/shaders/guest/advanced/crt-guest-advanced-ntsc-pass1.slang"
alias14 = "Pass1"
wrap_mode14 = "clamp_to_border"
mipmap_input14 = "false"
filter_linear14 = "true"
float_framebuffer14 = "true"
srgb_framebuffer14 = "false"
scale_type_x14 = "viewport"
scale_x14 = "1.000000"
scale_type_y14 = "source"
scale_y14 = "1.000000"
shader15 = "shaders_slang/crt/shaders/guest/hd/gaussian_horizontal.slang"
alias15 = ""
wrap_mode15 = "clamp_to_border"
mipmap_input15 = "false"
filter_linear15 = "true"
float_framebuffer15 = "true"
srgb_framebuffer15 = "false"
scale_type_x15 = "absolute"
scale_x15 = "800"
scale_type_y15 = "source"
scale_y15 = "1.000000"
shader16 = "shaders_slang/crt/shaders/guest/advanced/gaussian_vertical.slang"
alias16 = "GlowPass"
wrap_mode16 = "clamp_to_border"
mipmap_input16 = "false"
filter_linear16 = "true"
float_framebuffer16 = "true"
srgb_framebuffer16 = "false"
scale_type_x16 = "absolute"
scale_x16 = "800"
scale_type_y16 = "absolute"
scale_y16 = "600"
shader17 = "shaders_slang/crt/shaders/guest/hd/bloom_horizontal.slang"
alias17 = ""
wrap_mode17 = "clamp_to_border"
mipmap_input17 = "false"
filter_linear17 = "true"
float_framebuffer17 = "true"
srgb_framebuffer17 = "false"
scale_type_x17 = "absolute"
scale_x17 = "800"
scale_type_y17 = "absolute"
scale_y17 = "600"
shader18 = "shaders_slang/crt/shaders/guest/advanced/bloom_vertical.slang"
alias18 = "BloomPass"
wrap_mode18 = "clamp_to_border"
mipmap_input18 = "false"
filter_linear18 = "true"
float_framebuffer18 = "true"
srgb_framebuffer18 = "false"
scale_type_x18 = "absolute"
scale_x18 = "800"
scale_type_y18 = "absolute"
scale_y18 = "600"
shader19 = "shaders_slang/crt/shaders/guest/advanced/crt-guest-advanced-ntsc-pass2.slang"
alias19 = ""
wrap_mode19 = "clamp_to_border"
mipmap_input19 = "false"
filter_linear19 = "true"
float_framebuffer19 = "true"
srgb_framebuffer19 = "false"
scale_type_x19 = "viewport"
scale_x19 = "1.000000"
scale_type_y19 = "viewport"
scale_y19 = "1.000000"
shader20 = "shaders_slang/crt/shaders/guest/advanced/deconvergence-ntsc.slang"
alias20 = ""
wrap_mode20 = "clamp_to_border"
mipmap_input20 = "false"
filter_linear20 = "true"
float_framebuffer20 = "false"
srgb_framebuffer20 = "false"
scale_type_x20 = "viewport"
scale_x20 = "1.000000"
scale_type_y20 = "viewport"
scale_y20 = "1.000000"
pf_hdr_enable = "2.000000"
textures = "SamplerLUT1;SamplerLUT2;SamplerLUT3;SamplerLUT4"
SamplerLUT1 = "shaders_slang/crt/shaders/guest/advanced/lut/trinitron-lut.png"
SamplerLUT1_mipmap = "false"
SamplerLUT1_wrap_mode = "clamp_to_border"
SamplerLUT2 = "shaders_slang/crt/shaders/guest/advanced/lut/inv-trinitron-lut.png"
SamplerLUT2_mipmap = "false"
SamplerLUT2_wrap_mode = "clamp_to_border"
SamplerLUT3 = "shaders_slang/crt/shaders/guest/advanced/lut/nec-lut.png"
SamplerLUT3_mipmap = "false"
SamplerLUT3_wrap_mode = "clamp_to_border"
SamplerLUT4 = "shaders_slang/crt/shaders/guest/advanced/lut/ntsc-lut.png"
SamplerLUT4_mipmap = "false"
SamplerLUT4_wrap_mode = "clamp_to_border"

[anikom15]

@PlainOldPants apologies if you already discussed this somewhere but I was wondering if you have done gamut analysis on more modern TV color enhancement features like on an LCD. It would be interesting if it is at all related to what consumer CRT TVs are doing with color.

[PlainOldPants]

I have not done that sort of analysis on any modern displays yet. I have a couple modern TV sets, which don’t have great image quality, but I seldom use them. They’re mainly used by other family members that I live with.

At least, I have tried playing around with settings. I was able to turn off a couple settings that had been “enhancing” the image by oversaturating it and causing details to get clamped and disappear. One thing that stuck out to me was that an LG set had a “Dynamic Color” feature that could be set to Off, Low, Mid, or High, and it was keeping colors near the red/yellow/green boundary in place while moving other colors towards blue. I might try to get pictures of this, and maybe get rough measurements with the X-Rite i1Display 2.

As for now, I don’t have the time to be working on anything here, but I’ve been checking on these forums every once in a while. I have too many other things going on.