I'm trying to mix to shaders with the use of an alpha texture. I UV unwrapped the cube and adjusted the mapping but it still doesn't work. On the top of the cube there should be a P with the Glossy Shader.
In your screen shot you plugged the
alpha channel from the image in the the
Just plug the color socket of the image texture in to the factor of the
The alpha channel of an image stores where the image is clear. The image in your question does not have an alpha channel, so it will be all white. If you used a
png with transparency in the image then you would use the alpha channel as the mix factor.
If you change your image, delete all the black part so that it is clear. Then the alpha and color channels would be the same. White only where the letter