- Posts: 785
- Joined: Sat Feb 19, 2022 12:45 am
- Real Name: Alexander Dali
Wed Apr 26, 2023 8:03 pm
One of the settings in Resolve’s color management sections is ‘Apply resize transformations in’ and when I switch from ‘Color Science = DaVinci YRB Color Managed, Color Processing = SDR Rec709’ to ‘Color Processing = Custom’ Resolve automatically sets it to ‘Gamma’ but if I switch from ‘Color Science = DaVinci YRB Color Managed, Color Processing = HDR DaVinci Wide Gamut Intermediate’ to ‘Color Processing = Custom’ Resolve automatically sets it to ‘Log’.
So obviously DR believes resize transformations when using HDR timeline should be done in ‘Log’.
DR’s manual on this setting says:
- Timeline: Uses the Timeline Color Space to perform all resizing operations.
- Log: Uses a Log Color Space for resizing. Good for avoiding artifacts in certain high-contrast images, such as titles and star fields.
- Linear: Usually provides the best results with most SDR media.
- Linear Mapped: Usually provides the best results with most HDR media.
- Gamma: Provided in case you find a need for this option.
- Gamma Mapped: Usually provides best results when mixing SDR media with wide gamut and log-encoded media on the same timeline.
and doesn’t provide any info beyond that (that I know of).
Reading these descriptions leaves me with following questions:
1. If ‘linear mapped’ provides BEST results with MOST HDR media wouldn’t ‘linear mapped’ be better choice for this setting than ‘Log’ when using DWGI timeline with footage that uses HLG, SLog, CLog …? Are there reasons to avoid using ‘linear mapped’ and stick with ‘log’ and, if yes, what they are?
2. If ‘gamma mapped’ ‘usually provides best results when mixing SDR media with wide gamut and log-encoded media on the same timeline’ wouldn’t that be better setting than ‘log’ or ‘linear mapped’ for those that process classic SDR Rec709 footage on DWGI timeline, even when there is no wide gamut log encoded media on that timeline? Are there reasons to avoid using ‘gamma mapped’ and stick with ‘log’ or ‘linear mapped’ when using SDR media on DWGI timeline and, if yes, what they are?
3. Arri LogC4 is HDR log encoded media yet Arri, in their PDF on how to grade LogC4 footage from Alexa 35, instructs to use DWGI timeline and apply transformations in ‘gamma’ which is what DR uses when timeline is SDR Rec709. What would be reason for this discrepancy, whose settings would be correct, and why, please?
So obviously DR believes resize transformations when using HDR timeline should be done in ‘Log’.
DR’s manual on this setting says:
- Timeline: Uses the Timeline Color Space to perform all resizing operations.
- Log: Uses a Log Color Space for resizing. Good for avoiding artifacts in certain high-contrast images, such as titles and star fields.
- Linear: Usually provides the best results with most SDR media.
- Linear Mapped: Usually provides the best results with most HDR media.
- Gamma: Provided in case you find a need for this option.
- Gamma Mapped: Usually provides best results when mixing SDR media with wide gamut and log-encoded media on the same timeline.
and doesn’t provide any info beyond that (that I know of).
Reading these descriptions leaves me with following questions:
1. If ‘linear mapped’ provides BEST results with MOST HDR media wouldn’t ‘linear mapped’ be better choice for this setting than ‘Log’ when using DWGI timeline with footage that uses HLG, SLog, CLog …? Are there reasons to avoid using ‘linear mapped’ and stick with ‘log’ and, if yes, what they are?
2. If ‘gamma mapped’ ‘usually provides best results when mixing SDR media with wide gamut and log-encoded media on the same timeline’ wouldn’t that be better setting than ‘log’ or ‘linear mapped’ for those that process classic SDR Rec709 footage on DWGI timeline, even when there is no wide gamut log encoded media on that timeline? Are there reasons to avoid using ‘gamma mapped’ and stick with ‘log’ or ‘linear mapped’ when using SDR media on DWGI timeline and, if yes, what they are?
3. Arri LogC4 is HDR log encoded media yet Arri, in their PDF on how to grade LogC4 footage from Alexa 35, instructs to use DWGI timeline and apply transformations in ‘gamma’ which is what DR uses when timeline is SDR Rec709. What would be reason for this discrepancy, whose settings would be correct, and why, please?