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--- doc:appunti:hardware:sjcam-8pro-ambarella-firmware-modding [2022/06/09 18:22] – [What gamma curves are applied on each video mode] niccolo
+++ doc:appunti:hardware:sjcam-8pro-ambarella-firmware-modding [2022/06/15 16:47] (current) – [White balance presets] niccolo
@@ Line 433: / Line 433: @@
 {{.:ambarella:bitrateeditor-wb-presets.png?direct&640|}}
+FIXME: It is not know how this table works. It seems that labels are wrong: **YA_min** and **YB_min** are repeated twice, may be they are **YA_max** and **YB_max**.
+White balance is probably applied as a series of linear transformations to the **four raw values** captured by te **[[wp>Bayer_filter|Bayer filter sensor]]**. The four channels are **Red**, **Green-on-red**, **Blue** and **Green-on-blue**, each transformation consists of a multiplier coefficient (slope) and an offset.
+^ Gr  | Green on Red  |
+^ Gb  | Green on Blue  |
+^ Ya  | Y channel value of target image?  |
+^ Yb  | Y channel value of reference image?  |
 ===== 3D LUT tables =====