Just the Sepia effect removal?

[Wosheereal]

I want to know how I could just have the Sepia post process effect removal? I saw what the rimlight removal looked and I don't like it.

[heatray]

just add this line

+++ CG/PostProcess.cg
 void
 ApplySepia( inout float4 c,
 		    float4 sepiaColour )
 {
 	float3 vBW = float3( 0.3, 0.59, 0.11);
 	float3 col = c.rgb;
 	float brightness = dot( col, vBW );
 
+	sepiaColour.a = 0.0;
 	c = float4(lerp(col, brightness * sepiaColour.rgb, sepiaColour.a), 1.0);
 }

or see https://steamcommunity.com/sharedfiles/filedetails/?id=1831638289