Sony Megatron Colour Video Monitor

RetroArch Additions Shaders
#1270

Hmm, I’m still not sure everything is correct. Shouldn’t the image change when I change the luminance settings and contrast in HDR settings? No matter what I pick there, it all looks the same. I’ve tried switching to D3D11 as well instead of Vulkan just to see if there’s any difference, doesn’t seem like it though.

Edit: Never mind, I changed back to Vulkan and now the parameters in the shader seem to change as intended, now I think I’ve gotten everything to work! Like stated before if seems to look great with the following settings on my LG OLED CX.

TV Settings:

  • Make sure HDMI Ultra Deep Colour is on for the HDMI port used.
  • Dynamic Tone Mappping : Off
  • Oled Light: 100
  • Contrast: 100
  • Brightness: 50
  • Sharpness: 10
  • Colour: 55

Windows Settings:

  • HDR enabled in Windows and calibrated using the HDR calibration tool from windows store.

Retroarch Settings:

  • Vulkan as driver in Retroarch
  • HDR enabled in Retroarch
  • HDR Settings in Retroarch:
  • Peak Luminance 720
  • Paper White Luminance: 550
  • Contrast: 5
  • Expand Gamut: On

Shaders Parameters:

  • #reference “:/shaders/shaders_slang/hdr/crt-sony-megatron-jvc-professional-TM-H1950CG-hdr.slangp”
  • hcrt_colour_space = “2.000000”
  • hcrt_max_nits = “720.000000”
  • hcrt_paper_white_nits = “550.000000”
  • hcrt_expand_gamut = “0.000000”
  • hcrt_lcd_subpixel = “1.000000”
2 Likes
#1271

Sorry the slightly confusing thing (ok very) is that this shader because it is natively HDR overrides any settings in the RA->Settings->Video->HDR menu (apart from turning on HDR itself that is). Instead use all the options in the ‘Shader Parameters’ menu underneath Quick Menu->Shaders.

EDIT: obviously you’ve found the correct options under shader params. When you change those are you saying nothing happens? You’ve definitely got HDR selected in the shader parameters too?

1 Like
#1272

Just to say you should probably put your TV brightness up to max. However this may not work when using HDR as HDR is supposed to override local settings but just in case…

EDIT: you can also use the ‘240p Test Suite’ and it’s grey ramps to calibrate your HDR settings - this is different for every TV or at least model of TV.

1 Like
#1273

Here’s some GBA shots of a preset I’ll probably release soon:

Screenshot_2022-10-14-22-53-14-20_92460851df6f172a4592fca41cc2d2e6
Screenshot_2022-10-14-22-53-14-20_92460851df6f172a4592fca41cc2d2e61423×1080 1.56 MB
Screenshot_2022-10-14-22-52-52-56_92460851df6f172a4592fca41cc2d2e6
Screenshot_2022-10-14-22-52-52-56_92460851df6f172a4592fca41cc2d2e61427×1080 1.42 MB
Screenshot_2022-10-14-22-49-36-43_92460851df6f172a4592fca41cc2d2e6
Screenshot_2022-10-14-22-49-36-43_92460851df6f172a4592fca41cc2d2e61080×1359 767 KB
Screenshot_2022-10-14-22-47-07-00_92460851df6f172a4592fca41cc2d2e6
Screenshot_2022-10-14-22-47-07-00_92460851df6f172a4592fca41cc2d2e61439×1080 1.4 MB
Screenshot_2022-10-14-23-01-09-84_92460851df6f172a4592fca41cc2d2e6
Screenshot_2022-10-14-23-01-09-84_92460851df6f172a4592fca41cc2d2e61424×1080 1.41 MB

4 Likes
Please show off what crt shaders can do!
#1274

With LG TVs it’s also important to change the label of the HDMI input that you’re using to match your input device. I have mine set to PC for example. I also use HDR (Game) colour setting.

You might want to lower your Peak Luminance value following @wilch’s advice.

You may also have to adjust your Black Level and Gamma settings for the Input. Power saving settings also significantly affect the brightness of the screen.

1 Like
#1275

Sorry the slightly confusing thing (ok very) is that this shader because it is natively HDR overrides any settings in the RA->Settings->Video->HDR menu (apart from turning on HDR itself that is). Instead use all the options in the ‘Shader Parameters’ menu underneath Quick Menu->Shaders.

Ah, that’s why nothing happened when I tried changing the settings there, quite confusing yes :slight_smile: Things do change when editing the shader parameters though.

Just to say you should probably put your TV brightness up to max. However this may not work when using HDR as HDR is supposed to override local settings but just in case…

Brightness is at 100 on the TV, or are you talking about some other brightness?

With LG TVs it’s also important to change the label of the HDMI input that you’re using to match your input device. I have mine set to PC for example. I also use HDR (Game) colour setting.

You might want to lower your Peak Luminance value following @wilch’s advice.

You may also have to adjust your Black Level and Gamma settings for the Input. Power saving settings also significantly affect the brightness of the screen.

@Cyber: Yep, I’ve changed the input to PC as well to be able to use 2160p@120hz. I think I’m using the same Peak Luminance as @Wilch. 720? Power saving is completely off, like you say it ruins the brightness.

When you say black level and gamma for the input, you’re talking about TV settings right? Black Level settings are Low/High/Auto where I have Auto. Gamma is grayed and can’t be changed, but looks like it’s at 2.2

2 Likes
#1276

Ah sorry I thought you said it was at 50% brightness on your TV.

#1277

You don’t have a usual gamma curve in rec.2020 (i.e HDR) as it uses a PQ transfer function instead to map up to 10,000 nits. This is controlled by the app/content and not the end user now and so is why it’s greyed out. This is something that I probably need to recheck in RetroArch as I’m not sure I’m passing the correct values back to the TV especially for the Vulkan driver.

2 Likes
#1278

Ah ok. Seems like I’m getting the hang of the most important settings then. I had never used the 240p Suite before, only seen screenshots of it, but I just downloaded it and booted it in bsnes.

How would I use the Gray Ramp to calibrate for HDR?

1 Like
#1279

My bad. OLED Light is at 100 but Brightness is at 50. With Brightness at 100 everythings looks really washed out and bad, looks correct at 50.

2 Likes
#1280

Interesting, you may need to recalibrate it at the higher brightness level i.e adjust your paper white, peak nits gamma etc. On the grey bars in the test suite you need to be able to see all the bars individually as in all the very light grey’s haven’t merged into the white bar and all the very dark grey’s haven’t merged into the black bar. Tweak said values until you get the right look.

1 Like
#1281

Sorry, Does this setting exist? Not found in RA v1.11 menus

1 Like
#1283

Sorry, Does this setting exist? Not found in RA v1.11 menus

It’s not visible if HDR is disabled in Windows.

3 Likes
#1284

I believe it should be left at 50. OLED light brightens the image correctly which is already at 100. Brightness at 50 is ‘normal’ and going higher will turn black to grey

3 Likes
#1285

GBA-GBI preset released - you should be able to update slang shaders either today or tomorrow to get it.

This is more of an artistic representation than an actual screen but it brings out GBA games so well I thought I’d release it.

Screenshot_2022-10-17-17-31-35-71_92460851df6f172a4592fca41cc2d2e6
Screenshot_2022-10-17-17-31-35-71_92460851df6f172a4592fca41cc2d2e61423×1080 1.21 MB
Screenshot_2022-10-17-17-31-11-34_92460851df6f172a4592fca41cc2d2e6
Screenshot_2022-10-17-17-31-11-34_92460851df6f172a4592fca41cc2d2e61428×1080 1.24 MB
Screenshot_2022-10-17-17-30-43-48_92460851df6f172a4592fca41cc2d2e6
Screenshot_2022-10-17-17-30-43-48_92460851df6f172a4592fca41cc2d2e61429×1080 1.38 MB
Screenshot_2022-10-17-17-30-09-88_92460851df6f172a4592fca41cc2d2e6
Screenshot_2022-10-17-17-30-09-88_92460851df6f172a4592fca41cc2d2e61404×1080 1.45 MB
Screenshot_2022-10-17-17-29-29-17_92460851df6f172a4592fca41cc2d2e6
Screenshot_2022-10-17-17-29-29-17_92460851df6f172a4592fca41cc2d2e61425×1080 1.38 MB
Screenshot_2022-10-17-17-28-40-28_92460851df6f172a4592fca41cc2d2e6
Screenshot_2022-10-17-17-28-40-28_92460851df6f172a4592fca41cc2d2e61435×1080 1.62 MB
Screenshot_2022-10-17-17-27-46-41_92460851df6f172a4592fca41cc2d2e6
Screenshot_2022-10-17-17-27-46-41_92460851df6f172a4592fca41cc2d2e61428×1080 1.31 MB

9 Likes
Please show off what crt shaders can do!
#1286

Hey Cactus, I freakin’ love your AutoHDR addon for ReShade. I was wondering if I might be able to trouble you for a little help? I’ve got a couple of games that are D3D11 that I would love to use it in, but for some reason, I get errors of one sort or another. Usually the ReShade log shows some stuff culiminating with this:

15:00:11:742 [02428] | INFO | Redirecting IDXGISwapChain::ResizeBuffers(this = 000001CB1D2739B0, BufferCount = 1, Width = 3840, Height = 2160, NewFormat = 28, SwapChainFlags = 0x2) … 15:00:11:742 [02428] | ERROR | IDXGISwapChain::ResizeBuffers failed with error code E_INVALIDARG! 15:00:12:102 [02428] | INFO | Unregistered add-on “AutoHDR64”. 15:00:12:102 [02428] | INFO | Exiting …

Thanks in advance! PS I’d be absolutely chuffed if you worked out a way to make it work in Vulkan as well :wink:

1 Like
#1287

Hi @ZeroHour glad it works for you! Hmm that is strange - it’s basically saying it can’t create a back buffer of that format and with those flags. Maybe the game is providing odd flags that when combined with the format means its not supported? Hmm what game(s) is it? I can try and repro it and see if I can get it to work. I’ve been pushed for time recently as I’ve been building a big tool but hopefully I’ll get some time to revisit this soon.

2 Likes
#1288

Nice GBA shots!

Has this gray ramp issue been solved?

240pSuite-221020-113403
240pSuite-221020-1134031495×1120 377 KB

1 Like
#1289

Thanks!

I believe so - I presume you’re talking about the dark grey’s in the image? Obviously it depends on your settings too.

1 Like
#1290

The crushed blacks, yeah. What was the solution? It’s still looking like a bit of a steep falloff at the low end. I thought there was something in dogway’s grading shader that addresses this? Sigmoidal gamma? Or is there just a simple adjustment to the settings?

Here are the changes I’ve made:

240pSuite-221020-113403
240pSuite-221020-1134031495×1120 377 KB

#reference "shaders_slang/hdr/crt-sony-megatron-aeg-CTV-4800-VT-hdr.slangp"
hcrt_hdr = "0.000000"
hcrt_gamma_out = "2.204996"
hcrt_crt_screen_type = "0.000000"
hcrt_crt_resolution = "3.000000"
hcrt_brightness = "0.250000"
hcrt_contrast = "-0.000000"
hcrt_gamma_in = "2.200000"
hcrt_red_scanline_min = "0.700000"
hcrt_red_scanline_max = "0.800000"
hcrt_green_scanline_min = "0.700000"
hcrt_green_scanline_max = "0.800000"
hcrt_blue_scanline_min = "0.700000"
hcrt_blue_scanline_max = "0.800000"
1 Like