Grayscale shader, can I make modified textures appear brighter?

Hi,

I am completely unfamiliar with shaders.
I am using this shader to make texture appear on GUI as grayscale.

Code (csharp):

1. Shader "Custom/Grayscale" {
2.     Properties {
3.         _MainTex ("Base (RGB) Trans (A)", 2D) = "white" {}
4.     }
5.  
6.     SubShader {
7.         Tags {"Queue"="Transparent" "IgnoreProjector"="True" "RenderType"="Transparent"}
8.         LOD 200
9.  
10.         CGPROGRAM
11.         #pragma surface surf Lambert alpha
12.  
13.             sampler2D _MainTex;
14.  
15.             struct Input {
16.                 float2 uv_MainTex;
17.             };
18.  
19.             void surf (Input IN, inout SurfaceOutput o) {
20.                 half4 c = tex2D(_MainTex, IN.uv_MainTex);
21.                 o.Albedo = dot(c.rgb, float3(0.22, 0.707, 0.071));
22.                 o.Alpha = c.a;
23.             }
24.  
25.         ENDCG
26.     }
27.  
28.     Fallback "Transparent/VertexLit"
29. }

The only problem is that textures appear very dark, almost black.
Is there a way to make them brighter?


Thank you.

 

o.Albedo = dot(c.rgb, float3(0.22, 0.707, 0.071));

the weights doesn't exactly add up 0.22+ 0.707+ 0.071 = 0.998 but is still should be good enough.
You could test with a pure white texture with a white alpha ("opaque") to see if it comes out white (or very close, could be 254,254,254). If it doesn't something else is tinting your mesh, most likely vertex colors or a post effect.

 

Hi,

I am new to it and didn't understand some things you said. The shader code above wasn't created by me.

1. I created following texture and it appears pretty dark: #666666 to be exact.

How can I find what causes this?

2. What do you mean regarding weights doesn't add up? Should there be solid 1?


Thank you.

 

change o.Albedo to o.Emission, or write a new fragment shader that is not effected by lights in scene.

 

Woooow! You are the greatest! It works perfectly! Thanks a lot!