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How Do I Make B&W Renders in DAZ?

HonzoHonzo Posts: 193
in New Users

I was thinking that just turning down the saturation in render settings would work, but does that speed up render times? I'm looking for a method that will make the renders quicker.

Comments

  • Richard HaseltineRichard Haseltine Posts: 100,765

    Why would making the render monochome speed it up?

  • HonzoHonzo Posts: 193

    Doesn't need color information?  

  • ChezjuanChezjuan Posts: 514
    edited March 2022

    So just for the fun of it I made a simple scene and rendered it in Iray once with saturation at 1.0 and once with saturation at 0.0, making it B/W. All other settings were the same.

    Surprisingly, the B/W render took 1/3 of the time with about 1/3 of the iterations... here is the relevant portion of the log for each render:

    2022-03-01 17:15:23.940 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend progr: Received update to 00391 iterations after 90.610s.
    2022-03-01 17:15:23.968 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend progr: Convergence threshold reached.
    2022-03-01 17:15:26.488 [INFO] :: Saved image: ...\AppData\Roaming\DAZ 3D\Studio4\temp\render\r.png
    2022-03-01 17:15:26.499 [INFO] :: Finished Rendering
    2022-03-01 17:15:26.541 [INFO] :: Total Rendering Time: 1 minutes 37.73 seconds

    B/W:
    2022-03-01 17:18:17.124 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend progr: Received update to 00126 iterations after 31.138s.
    2022-03-01 17:18:17.152 Iray [INFO] - IRAY:RENDER ::   1.0   IRAY   rend progr: Convergence threshold reached.
    2022-03-01 17:18:18.921 [INFO] :: Saved image: ...\AppData\Roaming\DAZ 3D\Studio4\temp\render\r.png
    2022-03-01 17:18:18.932 [INFO] :: Finished Rendering
    2022-03-01 17:18:18.978 [INFO] :: Total Rendering Time: 37.0 seconds

    Edited to add:

    And the above makes sense, if Iray has to do RGB calculations with a regular render, that means that it has to calculate once for each color, wheras in B/W it only has to calculate once. Though the 1/3 time could also be a coincidence.

    Color Test 1.jpg
    2560 x 1440 - 2M
    Color Test 2.jpg
    2560 x 1440 - 2M
    Post edited by Chezjuan on
  • HonzoHonzo Posts: 193

    Thanks a lot! That's very helpful.

  • Richard HaseltineRichard Haseltine Posts: 100,765

    On reflection that is reasonable, and a factor of 1/3 is sensible, as each pixel has only one value that needs to converge instead of three.

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