Theia, Artifact heavey at most settings on DVD resolution sources

Topaz Video AI Bugs and Issues
1

This has always been the case with Theia, even in 2.6.4, but no one else seems to have ever reported it.

Theia, at most setting parameters, produces grid patterns on motion. (At least at DVD resolutions. I have not tested higher. [Both Fidelity and Detail act the same. {Excluding 0 values.}])
Here’s some example images. These all have been ran through Theia at 100% scale, then passed through Proteus Manual with everything set to zero, (My test script was already set up that way. It would have been harder to remove it.) to show the grid patterns more clearly. (And also that’s how I want to use Theia anyway—as a denoiser before Proteus.)
Revert Compression: 0
Sharpen: 30
Reduce Noise: 60
image
Revert Compression: 50
Sharpen: 0
Reduce Noise: 20
image
Revert Compression: 20
Sharpen: 30
Reduce Noise: 92
image

And how about some totally unrealistic settings? This is just to exaggerate the artifacts that generally show up. In case you couldn’t identify them from the other examples.
Revert Compression: 20
Sharpen: -100
Reduce Noise: -100
image

And now, let us go crazy trying them on a black and white movie.
Revert Compression: -100
Sharpen: -100
Reduce Noise: -100

image
image1438×1078 191 KB

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2

I haven’t really gotten Themis to work if i put it in the stack. Often I think it gets a little too sharp. Maybe one can unsharp it a notch in an editor after.

3

Oh I’ve never tried Themis…

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4

He is talking about “Theia”, not “Themis”

5

you find these patterns in proteus too if you ramp up the “recover details” slider by too much (which, as said, does not recover any details but makes the existing ones more visible). I reported this two times at least.

1 Like
7

Thank you for reporting this issue and sharing those example frames. I will mark this as an issue to look into in future updates to the Theia model. Right now our team is working on an updated version of Proteus, but in future update cycles we will look into this issue and see what can be done to improve the result in a 2-pass workflow.

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