A very good compromise can be to use mask strengths between 95 and 100. For example 98.
You have to manually edit the preset file to enter those increments I think. Not sure if things are more granular if you click on the parameter and open the value selection menu.
You can also use mask gamma for fine tuning. Like set the mask to 0.9 and decrease mask gamma. I like to mention this because it’s a quite useful feature but commonly overlooked.
Yes, I’ve noticed it and experimented with this I’m my recent presets as well. After lowering my mask strength to 98 or even 95, mask gamma can be used to redarken/resaturate the mask without somehow darkening the image.
It really alters the image quite a bit though in terms of brightness and colour.
What are Scanline and Mask Falloff for?
This is mostly usable when using stronger scanlines, especially with darker pixels. Mask falloff emulates individual phosphor sizes ‘shrinking’ if the color component is weaker in presence. When mask strength is quite high this can also help to saturate the appearance. Scanline falloff determines how fast the scanlines are getting thinner with certain setups. Default value is still 1.0 as neutral to old behavior, but lower values can be more realistic.
New Release Version (2022-02-15-r1):
Notable changes:
Download link:
https://mega.nz/file/k1hxmSpS#n1snXv8NW0f_4r3uqYhqrS6sP5UGNWfKj9MSXo8Y34w
Where can I read up-to-date documentation about this shader and it’s parameters? I was reading the README on the Libretro slang shaders repository about the special parameters for mask 7, but I can’t get the value Slot Mask Height and the others to do anything. I tried with various masks and nothing changes. I don’t know what I’m doing wrong.
Masks require some experience to setup indeed. I didn’t refresh the documentation yet because the shader was in development, which required most of the attention.
But otherwise it’s quite intuitive and you should be proficient after like half of hour of tweaking.
If you are after BW masks, then you can use mask 7 (width of 2) or mask 8 (width of 3).
Slotmask effect is seperate and can be used with any mask, maybe not with mask 1, which already includes it’s own slotmask effect.
To activate slotmask, just increase both slotmask strengths to like 0.5, match the width with the mask and that’s it.
If you are after BW masks, then you can use mask 7 (width of 2) or mask 8 (width of 3).
To activate slotmask, just increase both slotmask strengths to like 0.5, match the width with the mask and that’s it.
I tried what you just described but nothing happens. Changing mask width with mask 7, 8, or any other, does no change at all to the picture.
I’m on Linux on Vulkan, if that matters.
EDIT: My bad, I was just adjusting one of the mask strengths and not the other one. I can see an effect when I change mask width now.
Indeed it would be very hard to find this out without any kind of documentation. Thank you for the help and for this amazing shader!
I’m just here to cheer you up. I’ve been using your shader for a long time, it’s the best for me so far. I was just like “mehh, it misses some proper overscanning options, for games that don’t fit fullscreen very well” (I was using venom2.) Then I knew about this advanced version and I saw you implemented overscan. Perfect, game, set and match for me.
However, the version in Retroarch (in-app download) repo still misses Overscan X, although it seems it was added in your shader a few months ago?
Yes, I haven’t updated the one in the repo in a while. Guest is very active in adding new features, so I only update it periodically.
Way less headache inducing 
Alternatively, is there a git repository for the latest version of this shader published anywhere else @guest.r ?
Latest version is in this thread, just find the most recent post by Guest, that also has a Mega link
Currently Guest doesn’t have a GitHub setup for this shader (at the very least not one that’s public afaik)
Oh that’s a shame. A git repo would be very convenient to pull updates from. 
I also feel more comfortable to post updates this way. I’ll do some checks, but i think current version is almost ready now for merging.
It doesn’t matter this much i guess for the crt shader, maybe you can visit my github for some other shaders. Won’t be this relevant soon, if the shaders are updated in the official repository though.
In the last pass lol. 
Hi, Would you consider having the option of keeping the horizontal scanlines while in tate mode to get the grid effect ?
Lately I have been using an overlay with your shader in tate mode combined with “g-sharp_deblur” , the produced grid effect looks sharper and brighter than the presets in handheld folder. The overlay tho will only works in 240p , so DS and GBA doesn’t look right.
It’s basically not doable without rewriting a large part of the shader. An overlay is your best option i guess and it’s also a viable option. There is also a shader called lcd-grid, which is incorporated in the hsm mega bezel. Otoh you can use the BW mask (8) with slotmask to create some sort of the grid effect.
