alternate CAS as found in SweetFX feasible to avoid RCAS artifacts?

[aufkrawall]

When applying RCAS with high strength, it can cause weird artifacts (as described in Config.md). The CAS shader in ReShade SweetFX can apply quite strong sharpen with e.g. a strength of 2.0, but doesn't seem to have this issue. Which is why I wonder if applying CAS like that could be feasible inside OptiScaler too?

[cdozdil]

Hi,

Funny thing is we started with CAS, because of these artifacts I have adapted RCAS (which prevented these issues.

Need to update issues page 😊

[aufkrawall]

With high RCAS sharpen strength, I'm getting weird bright image areas:

Seems to be more distinct with FSR 3.1 than with XeSS. This doesn't occur with the SweetFX shader via ReShade.

[cdozdil]

I have used this shader as referance, could you check if it's producing similar issues?

https://github.com/RdenBlaauwen/RCAS-for-ReShade/blob/main/RCAS.fx

[aufkrawall]

The issue does not occur with that RCAS shader used in ReShade.

[cdozdil]

Hi,

Could you try this build?

nvngx.zip

[aufkrawall]

It doesn't seem to occur with this build, but the sharpen effectiveness of RCAS also seems to be reduced to (almost?) non-existent.

[cdozdil]

Hi,

I just checked on some games on my notebook, RCAS seems to be working?

[aufkrawall]

Yeah, however with that new build, it looks way softer than RCAS via ReShade at the same strength:

[cdozdil]

Hi,

Thanks for pointing this out, I found a mistake on my shader code (multiplied with denoise value twice).
Could you check if this build fixes the issue?

nvngx.zip

[aufkrawall]

Thanks! They are closer to each other now (I also forgot to re-enable the denoiser in the ReShade shader for the previous screenshots...), but I think ReShade is still a tad sharper?

The ReShade shader also allows to enter a sharpen strength of up to 1.3 (I used 1.0 though), maybe that would be the cheapest way to get to higher sharpen strength in OptiScaler? 🐸 As FSR 3.1 also is quite soft.

[cdozdil]

Yeah, that was in my mind too. I will check and adapt it later today 👍🏻

[cdozdil]

Ok, prepared another test build.

nvngx.zip

[aufkrawall]

Thanks, it definitely works now to get higher sharpen without the previous artifacts! :)
If I were nitpicky, I'd say the shader via ReShade still sharpens the image a bit more evenly. But you probably have far more exciting stuff on your agenda. Thanks again!

[cdozdil]

Thanks for helping me to sort out this issue 👍