white texture on a grid?

i have a grid in my scene facing the camera and i place a texture on it with a lot of white on it. What material should i use on it so the while look exact the same a when i open the texture in photoshop? so my texture should not be impacted by the light in the scene.

I think your best bet would be to use VertexLit, set the main and specular colours both to black, and set the emissive colour to 50% grey.

thx, that did a good job!