[libcamera-devel] [PATCH 04/13] ipa: ipu3: awb: Change minimal green threshold value

[Jean-Michel Hautbois]

When the zones are used for the grey world algorithm, we need a minimal
number of zones to make it relevant, and we want the green values to be
at least 32 today (with a maximum of 255).

This value is a bit high, as we now are correcting the black levels, and
a sudden change of colors can be visible for the end user when the gains
are applied.

Lower the value to 16.

Signed-off-by: Jean-Michel Hautbois <jeanmichel.hautbois at ideasonboard.com>
---
 src/ipa/ipu3/algorithms/awb.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ipa/ipu3/algorithms/awb.cpp b/src/ipa/ipu3/algorithms/awb.cpp
index 30693923..b18874a3 100644
--- a/src/ipa/ipu3/algorithms/awb.cpp
+++ b/src/ipa/ipu3/algorithms/awb.cpp
@@ -17,7 +17,7 @@ namespace ipa::ipu3::algorithms {
 
 LOG_DEFINE_CATEGORY(IPU3Awb)
 
-static constexpr uint32_t kMinGreenLevelInZone = 32;
+static constexpr uint32_t kMinGreenLevelInZone = 16;
 
 /**
  * \struct Accumulator
-- 
2.30.2