From 852ffae2a01a542df527c2c7ab3707bfe72ef420 Mon Sep 17 00:00:00 2001
From: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Date: Tue, 6 Jan 2026 17:00:56 +0000
Subject: [PATCH] libcamera: software_isp: lut: Change default Gamma to 1.0/2.2

Change the default softisp Gamma from 0.5 to 1.0/2.2.

Reviewed-by: Hans de Goede <johannes.goede@oss.qualcomm.com>
Reviewed-by: Milan Zamazal <mzamazal@redhat.com>
Tested-by: Robert Mader <robert.mader@collabora.com>
Tested-by: Hans de Goede <johannes.goede@oss.qualcomm.com> # ThinkPad T14s gen 6 (arm64) ov02c10 + X1c gen 12 ov08x40
Tested-by: Kieran Bingham <kieran.bingham@ideasonboard.com> # Lenovo X13s
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
---
 src/ipa/simple/algorithms/lut.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ipa/simple/algorithms/lut.cpp b/src/ipa/simple/algorithms/lut.cpp
index 7418daa1..54cb804e 100644
--- a/src/ipa/simple/algorithms/lut.cpp
+++ b/src/ipa/simple/algorithms/lut.cpp
@@ -35,7 +35,7 @@ int Lut::configure(IPAContext &context,
 		   [[maybe_unused]] const IPAConfigInfo &configInfo)
 {
 	/* Gamma value is fixed */
-	context.configuration.gamma = 0.5;
+	context.configuration.gamma = 1.0 / 2.2;
 	context.activeState.knobs.contrast = std::optional<double>();
 	updateGammaTable(context);