i wonder, how the result now, using that custom shader?

It works like a charm.

I would like to add that starting at Vuforia 6.5, you have to do this by selecting the ARCamera, clicking the "Open Vuforia Configuration" button and dragging the shader to the "Video Background Shader" slot.

Thank you again!

Yes, this is totally possible with a custom shader on the BackgroundPlane.



I copied the code from some place I can't remember unfortunately so I can't claim this shader as my own, but it works fine.

 

Shader "AddGamma" {
    Properties {
        _MainTex ("Base (RGB)", 2D) = "white" {}
    }
    SubShader {

    Pass{

        CGPROGRAM

        #pragma vertex vert
        #pragma fragment frag

        #include "UnityCG.cginc"

        sampler2D _MainTex;

        struct v2f {
            float4  pos : SV_POSITION;
            float2  uv : TEXCOORD0;
        };

        float4 _MainTex_ST;

        v2f vert (appdata_base v)
        {
            v2f o;
            o.pos = mul (UNITY_MATRIX_MVP, v.vertex);
            o.uv = TRANSFORM_TEX(v.texcoord, _MainTex);
            return o;
        }

        
        half4 frag(v2f i) : COLOR
        {
            half4 c = tex2D (_MainTex, i.uv);
			c.rgb = pow(c.rgb, 2.2);
            return c;
        }

        ENDCG
    }
    }



     
    FallBack "Diffuse"
}