Vertex Color Shader Non Linear Blending

Hello, brief question. So I have a simple vertex colored shader, which shows colors of vertices that I set in the script using mesh.colors. Shader:

    SubShader{
         Pass {
             Material {
                 Shininess[_Shininess]
                 Specular[_SpecColor]
                 Emission[_Emission]
             }
             ColorMaterial AmbientAndDiffuse
             Lighting On
             SeparateSpecular On
             SetTexture[_MainTex] {
                 Combine texture * primary, texture * primary
             }
             SetTexture[_MainTex] {
                 constantColor[_Color]
                 Combine previous * constant DOUBLE, previous * constant
             }
         }
 }

     Fallback " VertexLit", 1

}

Which results in something like this:

This is fine, but I would need it to be non linear, with fixed colors. More like this:

Is this somehow possible? Thank you in advance for any answers!