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Add a new tone mapper (#9614)

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The new tone mapper, dubbed "GT7" in the code, is based on
the Gran Turismo 7 tone mapper, as described in the SIGGRAPH
2025 presentation called "Driving Toward Reality: Physically
Based Tone Mapping and Perceptual Fidelity in Gran Turismo 7".

This tone mapper exhibits fewer hue skews than the other tone
mappers, at the exception of PBR Neutral. The GT7 tone mapper
is however better at preserving the perception of high
dynamic range.

The tone mapper, as implemented, targets an SDR paper white
of 250 nits, using 100 cd/m^2 as the reference luminance (for
values of 1.0 in the linear HDR framebuffer). This can result
in an overall darker image compared to the other tone mappers
but this can be controlled through camera settings, post-
processing exposure, or lighting intensity.

The GT7 tone mapper also allows to target HDR output, and
could be made customizable via APIs if desired. The current
implementation offers a fixed aesthetic solution.
This commit is contained in:
Romain Guy
2026-01-21 17:31:27 -08:00
committed by GitHub
parent 7266fd67db
commit 73b60d4db8
8 changed files with 305 additions and 45 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
libs/viewer/src/ViewerGui.cpp
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@@ -178,6 +178,9 @@ static void computeToneMapPlot(ColorGradingSettings& settings, float* plot) {
case ToneMapping::PBR_NEUTRAL:
mapper = new PBRNeutralToneMapper;
break;
case ToneMapping::GT7:
mapper = new GT7ToneMapper;
break;
case ToneMapping::DISPLAY_RANGE:
mapper = new DisplayRangeToneMapper;
break;
@@ -229,7 +232,7 @@ static void colorGradingUI(Settings& settings, float* rangePlot, float* curvePlo
int toneMapping = (int) colorGrading.toneMapping;
ImGui::Combo("Tone-mapping", &toneMapping,
"Linear\0ACES (legacy)\0ACES\0Filmic\0AgX\0Generic\0PBR Neutral\0Display Range\0\0");
"Linear\0ACES (legacy)\0ACES\0Filmic\0AgX\0Generic\0PBR Neutral\0GT7\0Display Range\0\0");
colorGrading.toneMapping = (decltype(colorGrading.toneMapping)) toneMapping;
if (colorGrading.toneMapping == ToneMapping::GENERIC) {
if (ImGui::CollapsingHeader("Tonemap parameters")) {