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Im trying to reduce noise on my renders by using the denoise feature, but it makes the image very blurry specially the metallic parts, even when I reduce denoise strength to 0.2 it still has no effect, clamping indirect to 0.5 also doesnt help much. Also can't really afford to go beyond 500 samples to reduce the noise further since I got a long 2000 frame animation. Any other tricks or suggestions? Thanks enter image description here

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The blur is an artifact of how denoising is performed. It can't always be totally removed, but can be controlled to a certain extent by adjusting the Denoising parameters found in the Render Layers Tab of the Properties window. In the next screen shot I have moved denoise to the top of the tab. It is usually farther down.

Denoise parameters

The Diffuse, Glossy, Transmission and Subsurface parameters are flags that tell the denoiser to use those types of rays in calculating the replacement pixels. You can experiment with them to see if they help.

The Radius parameter sets the area of pixels around the pixel being denoised to consider when calculating the replacement color.

The strength parameter controls how much to consider the surrounding pixels.

The feature strength parameter controls the number of passes over the image the denoiser makes.

If you hover over each parameter it will give a brief summary of the effect caused by that parameter.

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  • $\begingroup$ Thanks, tried those, turning off noise reduction on diffuse is most effective since the metallic object is surrounded by diffuse objects, however, it still doesn't solve the issue that diffuse objects will still have noise on them. Ended up brining direct clamping to 0.5 and indirect clamping to 1.5 to reduce noise as much as possible. not a perfect solution. $\endgroup$ – Cyrus Nov 28 '18 at 2:28
  • $\begingroup$ don't use direct clamping at levels lower than 1! That will only affect the brightness of your scene. $\endgroup$ – cegaton May 27 at 4:19

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