From 5860ded4716170b562c3e915c7eebb879742dcd4 Mon Sep 17 00:00:00 2001
From: Ahmet Inan <xdsopl@gmail.com>
Date: Fri, 16 Apr 2021 17:53:43 +0200
Subject: [PATCH] use revised value K0 for SRGB

---
 yuv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/yuv.c b/yuv.c
index 2cdfcdb..edc0b59 100644
--- a/yuv.c
+++ b/yuv.c
@@ -18,7 +18,7 @@ uint8_t yuv_clamp(float x)
 uint8_t srgb(float linear)
 {
 	float v = fminf(fmaxf(linear, 0.0f), 1.0f);
-	float K0 = 0.03928f;
+	float K0 = 0.04045f;
 	float a = 0.055f;
 	float phi = 12.92f;
 	float gamma = 2.4f;
@@ -29,7 +29,7 @@ uint8_t srgb(float linear)
 float linear(uint8_t srgb)
 {
 	float v = srgb / 255.0f;
-	float K0 = 0.03928f;
+	float K0 = 0.04045f;
 	float a = 0.055f;
 	float phi = 12.92f;
 	float gamma = 2.4f;