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heavy banding with texture

8 ANTWORTEN 8
GELÖST
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Nachricht 1 von 9
froszu
1111 Aufrufe, 8 Antworten

heavy banding with texture

I'm experiencing heavy banding with a particular texture. Please take a look at attached screenshot, it shows a plane with surfaceShader (no lighting).

-left: a texture as seen in XnView (png file),

-center: renderview with Arnold rendering (banding artifacts) and

- right: 3delight render (correct rendering for comparision).

Other facts:

- rendering arnold to mayaRenderView or arnoldView gives banding

- rendering arnold to EXR gives banding

- rendering with 3delight to mayaRenderView gives banding (same as arnold)

- rendering with 3delight to EXR or 3delightDisplay gives correct result

I have colormanagement enabled with setting shown on screenshot.

It seems bading goes away if I disable colormanagement but this is not a solution.

Can anyone recommend any steps with this problem?

thanks !bading.pngcm-settings.pngtest-texture.png

8 ANTWORTEN 8
Nachricht 2 von 9

What colorspace is your texture set to in maya? It should be set to sRGB.



Ashley Handscomb Retallack
Senior Software Engineer (Arnold)
Arnold Documentation | Arnold Downloads
Nachricht 3 von 9
froszu
als Antwort auf: froszu

It is set to sRGB. I also tried with manually converting to .tx with proper colorspace settings. I get the same results

Nachricht 4 von 9
zenop
als Antwort auf: froszu

Converting the texture to 16 bit will most likely solve the issue, I'm curious why this is necessary though, since the banding isn't visible in the base texture.

Nachricht 5 von 9
froszu
als Antwort auf: froszu

I tried converting it to 32bit exr, in photoshop. Nothing..

I believe it has smth to do with maya color space handling.

Nachricht 6 von 9
froszu
als Antwort auf: froszu

OK, COnverting to 16bit tiff, in photoshop workarounds the issue.

However something seems to be wrong with maya.

Nachricht 7 von 9
froszu
als Antwort auf: froszu

Problem can be solved manually converting to .tx with a "-d float" option.

Default seems to be 8bit, hence quantization noise.

Nachricht 8 von 9
froszu
als Antwort auf: froszu

Is there any method to globally disable auto conversion for textures ?

Nachricht 9 von 9

you can disable auto-tx generation globally: https://support.solidangle.com/x/EAxkAg Only wise to do this if you are managaging the conversion and use of the tx files yourself



Ashley Handscomb Retallack
Senior Software Engineer (Arnold)
Arnold Documentation | Arnold Downloads

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