Simple grey world white balance

shaders/image.frag

@@ -5,6 +5,7 @@ uniform vec3 mtf_param;
 uniform bool bw;
 uniform bool invert;
 uniform bool srgb;
+uniform vec3 whiteBalance;
 in vec2 qt_TexCoord0;
 out vec4 color;
 
@@ -40,6 +41,8 @@ void main(void)
 
     if(srgb)color.rgb = Linear2sRGB(color.rgb);
 
+    color.rgb *= whiteBalance;
+
     if(any(lessThan(qt_TexCoord0, vec2(0.0))) || any(greaterThan(qt_TexCoord0, vec2(1.0))))
         color = vec4(0.0, 0.0, 0.0, 1.0);