Use Inverse DRT for SDR to HDR Conversion

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‌— Saturation Preserving: This option has a smooth luminance roll-off in the shadows and highlights to prevent clipping. It does so without desaturating dark shadows and bright highlights, so this is an effective option for colorists who like to push color a bit harder. However, because over saturation in the highlights of the image can look unnatural, two parameters are exposed to provide some user-adjustable automated desaturation.‌‌

— Sat. Rolloff Start: Lets you set a threshold, in nits (cd/m2), at which saturation will roll off along with highlight luminance. Beginning of the rolloff.

— Sat. Rolloff Limit: Lets you set a threshold, in nits (cd/m2), at which the image will be totally desaturated. End of the rolloff.

— RED IPP2: This setting lets you use RED IPP2 tone mapping to output to an SDR format, such as Rec. 709; two settings are exposed with which to choose how your output will be shaped.

— Output Tone Map: Lets you choose what kind of tone mapping you want to use for your output. Options include: None, Low, Medium, and High.

— Highlight Roll Off: Lets you choose what kind of highlight rolloff you want to use to prevent clipping. Options include: None, Hard, Medium, Soft, and Very Soft.

— HDR peak nits: A slider lets you choose the peak nit level you want to tone map to. Defaults to 10,000 nits.

Use Inverse DRT for SDR to HDR Conversion

This control is only visible while the Resolve Color Management presets menu is set to Custom Settings. A device rendering transform (DRT) is typically used when converting high dynamic range media to a lower dynamic range color space/mastering standard. Thus, setting up a color transform from SDR to HDR is an “inverse” operation to expand the dynamic range of SDR media to HDR standards. The way this works is that levels at 100 nits are mapped to the maximum value set for the Timeline Working Luminance parameter, and all other image levels are strategically tone mapped in order to give yourself a good starting point for grading SDR media into an HDR program.

NOTE: Turning on “Use Inverse DRT for SDR to HDR Conversion” may exaggerate noise in imported SDR media with large flat expanses of bright colors.

This setting also has a secondary use. With this setting turned on, you can output Rec. 709 clips with color that’s identical to the input, with no compression in the highlights.

Use White Point Adaptation

This control applies a chromatic adaptation transform to account for different white points between color spaces.

— Uncheck this box if you simply want to view the input color space’s white point unaltered in the output color space. For example, wanting to use a P3-D60 mastered clip inside a P3-D65 timeline for reference purposes.

— Check this box to apply the chromatic adaptation transform to convert the input white point to match the output color space’s white point. For example, wanting a P3-D60 mastered clip to cut in with other clips mastered in a P3-D65 timeline.

NOTE: This control is only visible while the Resolve Color Management presets menu is set to Custom Settings.

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