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libavfilter/vf_libplacebo: add temperature option

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Niklas Haas
2025-10-06 14:06:30 +02:00
committed by Niklas Haas
parent eab3b68237
commit 6f1ab828d3
2 changed files with 9 additions and 0 deletions
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5
doc/filters.texi
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@@ -16795,6 +16795,11 @@ coefficients for RGB inputs.
@item gamma
Gamma adjustment, between @code{0.0} and @code{16.0}. Defaults to @code{1.0}.
@item temperature
Color temperature adjustment. Lower values make the output warmer/redder,
down to @code{1667}, while higher values make the output cooler/bluer, up to
@code{25000}. Defaults to @code{6500} (neutral white).
@item cones
Cone model to use for color blindness simulation. Accepts any combination of
@code{l}, @code{m} and @code{s}. Here are some examples:

4
libavfilter/vf_libplacebo.c
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@@ -261,6 +261,7 @@ typedef struct LibplaceboContext {
float saturation;
float hue;
float gamma;
float temperature;
/* pl_peak_detect_params */
int peakdetect;
@@ -446,6 +447,8 @@ static int update_settings(AVFilterContext *ctx)
.saturation = s->saturation,
.hue = s->hue,
.gamma = s->gamma,
// libplacebo uses a normalized/relative scale for CCT
.temperature = (s->temperature - 6500.0) / 3500.0,
};
opts->peak_detect_params = *pl_peak_detect_params(
@@ -1723,6 +1726,7 @@ static const AVOption libplacebo_options[] = {
{ "saturation", "Saturation gain", OFFSET(saturation), AV_OPT_TYPE_FLOAT, {.dbl = 1.0}, 0.0, 16.0, DYNAMIC },
{ "hue", "Hue shift", OFFSET(hue), AV_OPT_TYPE_FLOAT, {.dbl = 0.0}, -M_PI, M_PI, DYNAMIC },
{ "gamma", "Gamma adjustment", OFFSET(gamma), AV_OPT_TYPE_FLOAT, {.dbl = 1.0}, 0.0, 16.0, DYNAMIC },
{ "temperature", "Color temperature adjustment (kelvin)", OFFSET(temperature), AV_OPT_TYPE_FLOAT, {.dbl = 6500.0}, 1667.0, 25000.0, DYNAMIC },
{ "peak_detect", "Enable dynamic peak detection for HDR tone-mapping", OFFSET(peakdetect), AV_OPT_TYPE_BOOL, {.i64 = 1}, 0, 1, DYNAMIC },
{ "smoothing_period", "Peak detection smoothing period", OFFSET(smoothing), AV_OPT_TYPE_FLOAT, {.dbl = 100.0}, 0.0, 1000.0, DYNAMIC },