Transparent/Diffuse problem for plane texture

Hi

I created plane and gave texture to it but when I change shader of this material to Transparent/Diffuse it’ll be dark although the main color is white .
So I want to know where the problem is !

Most probably the “main color” property of the shader is not set properly. Set to a dark tint.

Maybe your normals (or scale) are wrong?
E.g. zero or pointing in the wrong direction?
Helped me …

diffuse shader needs light pointing at it