Im creating textures for a model in photoshop. I've created the diffuse and spec, but I've run into a problem with the normal map. I've used the nvidea normal map filter to create the normal map. My first layer, which is my base texture was converted, HOWEVER, all of the layer that are stacked on top of my base layer DO NOT get converted properly. I am using layer masks which I've unlocked and also layer adjustments which affect only the selected layer, not all of the layers below, I've made sure that these layers are on 'normal' blending mode and have 100% opacity...I don't know what I'm doing wrong. Someone help please!! see images for reference