LUT Shader with linear mode?

I made a lut shader that goes inside my objects, Background, Characters etc so i can skip the post processing.

The problem is that the shader work well when the project is set as GAMMA, but when is Linear there is a really small color offset.

The LUT texture is marked as NOT SRGB.

the shader is this one

Code (CSharp):

1. #if ENABLE_LUT
2.  
3. //LUT Texture size (height)
4. #define COLORS 32.0
5.  
6. //Properties
7. sampler2D _LUT;
8. float4 _LUT_TexelSize;
9. float _Contribution;
10.  
11. //Gamma to Linear
12. // pow(color, 2.2)
13. // color * color
14. //Linear to Gamma
15. //pow(color, 1/2.2)
16. //sqrt(col)
17.  
18. inline float3 LUTColorGrading(float3 baseColor)
19. {
20.     //Convert to Gamma (Unity Linear mode i need this)
21.     float3 color = pow(baseColor, 1/2.22);
22.    
23.     float maxColor = COLORS - 1.0;
24.     float floatColX = 0.5 / _LUT_TexelSize.z; // Texture Width
25.     float floatColY = 0.5 / _LUT_TexelSize.w; // Texture Height
26.     float threshold = maxColor / COLORS;
27.    
28.     float xOffset = floatColX + color.r / COLORS * threshold;
29.     float yOffset = floatColY + color.g * threshold;
30.     float cell = floor(color.b * maxColor );
31.    
32.     float2 lutPos = float2(cell / COLORS + xOffset, yOffset);
33.  
34.     float3 gradedCol = tex2D(_LUT, lutPos).rgb;
35.     //Back to Linear (Unity Linear mode i need this)
36.     color = pow(gradedCol, 2.22);
37.    
38.     float3 returnColor = lerp(baseColor, color, _Contribution);
39.  
40.     return returnColor;
41. }
42.      

What can be wrong?

 

well the color shift is minimun, but unity post effect dont have the same issue. so is not about the lut texture.

 

is not saturate :/

 

Does it have to do with the way linear mode shades geometry?

 

Try to disable mipmaps in textures.

 

oh sorry, i fix it with shaderssss

 

I'm facing the same pb, can you share the process to remove the color offset ?