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Resizing after rendering

externalexternal Posts: 7
in The Commons

Hi everyone, quick question

I have been reading up on a few rendering tecniques, and one that i have noticed is to make the initial render big, and then downsize in Photoshop / Affinity Photo to a smaller size. What is the purpose of this, and why would it be beneficial? Im guessing the resize could help with denoising?

Thank you, and stay safe

Comments

  • AsariAsari Posts: 703
    external said:

    Hi everyone, quick question

    I have been reading up on a few rendering tecniques, and one that i have noticed is to make the initial render big, and then downsize in Photoshop / Affinity Photo to a smaller size. What is the purpose of this, and why would it be beneficial? Im guessing the resize could help with denoising?

    Thank you, and stay safe

    Yes it's also called manual over sampling. As you said, it is to cut down rendering time on noisy renders. The idea us this: render bigger, but with less iterations than needed to get rid of the noise and then downsize and during downsizing reduce the noise.

    You might have to test for yourself whether it works for you. I found out it doesn't work for me so well - yes less iterations cut down render time. But bigger images increase render time. And I render my still images generally in 4K so I would need to render in 8k ... which is significantly slower. YMMV

  • codex34_f5f1fb6f55codex34_f5f1fb6f55 Posts: 148

    I think it's because the noise filter adds significant time to the render, more than double size takes, when you resize from larger to smaller your effectively resampling the image, ie linear,bilinear,bicubic sampling, a post process resize can be done in seconds.

    What we really need is the Nvidia AI noise reduction tools.

  • mavantemavante Posts: 734
    codex34_f5f1fb6f55 said:

    I think it's because the noise filter adds significant time to the render

    Dreamlight did some tests, and according to them, the noise filter doesn't add time, at least not any appreciable amount. Difference of seconds. Here's the video about it:

    DAZ Studio Iray DeNoiser Put To The Test

     

     

  • jjmainorjjmainor Posts: 493
    In 3dl I see smoother images when I render bigger and scale down than when I render at the size I want.
  • L'AdairL'Adair Posts: 9,479
    external said:

    Hi everyone, quick question

    I have been reading up on a few rendering tecniques, and one that i have noticed is to make the initial render big, and then downsize in Photoshop / Affinity Photo to a smaller size. What is the purpose of this, and why would it be beneficial? Im guessing the resize could help with denoising?

    Thank you, and stay safe

    I think it's important to note this technique first came about when Iray was introduced to Daz Studio. Iray has come a long way since 2015, and so has Daz Studio. I'm not sure there are any real benefits to using this technique now; Unless, perhaps, one is using a computer on the lower end of the required hardware.

  • kyoto kidkyoto kid Posts: 41,847

    .,.rendering larger tends to take more memory which can mean dumping to the CPU on GPUs with lower VRAM. 

    There is also an option for rendering at a moderate size without sacrificing detail or quality and expanding the results post render.

    https://exposure.software/blowup/

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