So there seems to be a myriad of ways to create a specular map, but I'm wondering what the simplest way is, inside Photoshop. I wasn't planning on creating it from the normal map - I thought the simplest way to generate the spec map would be to duplicate my Diffuse layer, and use an Adjustment layer to desaturate, then alter the brightness and contrast.
Is this right? Or is there a 'better', or more effective way of generating a specular map, without being overly complicated? I'm not much of a Photoshop ninja, so I'm trying to keep it simple. I guess I'm more of a Photoshop nightwatchman right now.
Thanks in advance.