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enter image description here enter image description here

Following Blender Guru's Donut Tutorials and currently at the end of Part 1.

I'm really unsure about the false color concepts, grey is the ideal color so we have to tweak all the settings till its mostly grey?? Based on what I have read, this works like a heat map; so red and dark blue should be avoided at all cost??

Using cycles with basic settings.

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Generally, just try to avoid pure White and pure Black areas

  • White represents High end clipping - you lose details for anything brighter
  • Black represents Low End clipping - you lose details for anything darker

Three things to remember:

  1. You can always increase clipping later, but you can't recover clipped details from exported JPG/TIFF/PNG
  2. Keep as much details for editing and only clip colors in your final photo
  3. You can have as much clipping in your final photo as you want, there's no right or wrong

How to correct an overexposed photo (with pure white areas)

enter image description here

Here's a detailed chart of the values for the coloring for the false color:

enter image description here

Source: https://sobotka.github.io/filmic-blender/

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  • $\begingroup$ worth reading also: Using the False Color look in combination with the CDL Node to work on Wide Dynamic Range scenes $\endgroup$
    – susu
    Commented Sep 27, 2020 at 17:35
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    $\begingroup$ @JacymMichal. Instead of altering exposure for the scene, it would be advisable to modify the light sources' levels to accomodate the desired values. Or in the case of HDR used as environment lighting, modify the brightness there. $\endgroup$
    – susu
    Commented Sep 27, 2020 at 19:20
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    $\begingroup$ Oh sure, It's just to show one approach while keeping the answer as simple as possible :). $\endgroup$
    – jachym michal
    Commented Sep 27, 2020 at 19:23
  • $\begingroup$ "You can always increase clipping later, but you can't recover clipped details"— Technically the tradeoff is that you lose dynamic range detail, which you also can't recover, and can actually get pretty significant with 8-bit formats (thought not nearly as visually jarring as clipping, no). $\endgroup$
    – Will Chen
    Commented Oct 13, 2022 at 7:34
  • $\begingroup$ @WillChen That's a better explanation, thanks :) $\endgroup$
    – jachym michal
    Commented Oct 15, 2022 at 8:03
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wherever there is red color in this heat map , there is so light getting reflected that the exposure is making it almost impossible to see , and blue is so underexposed that it looses its detailed and is totally dark.

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