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Drastically Reduce Rendertime in Blender Cycles


Zacharias Reinhardt writes:

Hi everyone!

In this video I show you how to use the new denoising feature, to drastically reduce rendertime in Blender Cycles.

More info here.

Have fun!

About the Author

Avatar image for Zacharias Reinhardt
Zacharias Reinhardt

Founder and Lead Instructor @ CG Boost (


  1. After watching Zacharias Video. I tried the Noise Reduction Feature. Bammmmm! This thing is so f_____g big. I had a render that was noisy even with 2000 Samples. With the Noise Reduction turned on I changed it to 600 Samples and I fell on my knees. Cristal clearRender. Thank you lord for hearing my prayers. Whoever did this Noise Reduction Feature will stay in my heart forever. Peace y´all :)

  2. I did my own experiments with this and produced an image to show off the difference in render results based on number of samples with denoising turned on and off. Here's the link:

    All I can say is, WOW. This thing is going to make such a huge difference. This plus the other speed optimisations is really going to add up! Say goodbye to noise in renders! Either for quicker preview renders, or just removing that last bit of stubborn noise in a render, this thing is really going to make a huge difference.

    I think more experimentation is required though with transparent surfaces, volumetric objects and hair, to see how it handles very complicated objects, but so far it looks great!

  3. Just adding to my previous comment. You can see in the side by side comparisons that the 9min denoised render results look virtually identical to the 2hr 9min regular render results. That's a render time reduction of 93%! I say virtually identical, I opened up both images in Photoshop and did a difference comparison. There were obviously differences, but they were only very slight.

    To give you some statistics, after comparing the two (8bit) images, only 3% of the pixels in the denoised render had any difference at all (most of the differences were the absolute minimum possible of only 1/255). When I set the minimum difference to at least 8/256, aka a colour difference of at least 3%, only 0.01% of the pixels in the image had that degree of variation from the reference image. There was only 0.001% of pixels with a difference larger than 32/256 (12% variation from reference) and nothing above 48/256.

    So basically, almost virtually identical images, with only some very very subtle differences in colours. Those higher deviations in colours were all from the same spot in the image, from some artifacting around a bright specular reflection on a chrome object in my test scene. If I removed that (or maybe played with the clamping settings more?) I think the result would be near perfect.

  4. Awesome!!!

    this makes working with blender much easier,
    gives the render a more photographic look
    and also safes days (or months) of render time

    thank you very much!!!

  5. I just finished rendering 3000 Full HD frames at 1000 samples... without this noise reduction feature! I estimate this denoiser would have taken around 48-60 HOURS off my render time!

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