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Add night adaptation control to ColorGrading (#4559)

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In low-light conditions, peak luminance sensitivity of the eye shifts
toward the blue end of the visible spectrum. This effect called the
Purkinje effect occurs during the transition from photopic (cone-based)
vision to scotopic (rod-based) vision. Because the rods and cones use the
same neural pathways, a color shift is introduced as the rods take over to
improve low-light perception.

This function aims to (somewhat) replicate this color shift and peak
luminance sensitivity increase to more faithfully reproduce scenes in
low-light conditions as they would be perceived by a human observer
(as opposed to an artificial observer such as a camera sensor).

The night adaptation can be controlled using a 0..1 factor for artistic
reasons: `ColorGrading::Builder::nightAdaptation()`.
This commit is contained in:
Romain Guy
2021-08-30 17:19:56 -07:00
committed by GitHub
parent dcfc27857f
commit 0e574f3fce
13 changed files with 1563 additions and 9 deletions
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7
android/filament-android/src/main/cpp/ColorGrading.cpp
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@@ -90,6 +90,13 @@ Java_com_google_android_filament_ColorGrading_nBuilderExposure(JNIEnv*, jclass,
builder->exposure(exposure);
}
extern "C" JNIEXPORT void JNICALL
Java_com_google_android_filament_ColorGrading_nBuilderNightAdaptation(JNIEnv*, jclass,
jlong nativeBuilder, jfloat adaptation) {
ColorGrading::Builder* builder = (ColorGrading::Builder*) nativeBuilder;
builder->nightAdaptation(adaptation);
}
extern "C" JNIEXPORT void JNICALL
Java_com_google_android_filament_ColorGrading_nBuilderWhiteBalance(JNIEnv*, jclass,
jlong nativeBuilder, jfloat temperature, jfloat tint) {