yup, in photoshop use the levels tool. select the R, G and B seperately in the drop down and push the upper and lower range markers to outer range of the histogram. you could also sharpen the normal map as well but be careful not to blow out the finer details. also mind to renormalise after to prevent any weird normal…
well when you adjust the levels if you watch its mainly upping the contrast of your highs and low values so your normals get punched in and out deeper. similar to overlaying the normal map and neutralizing the blue channel i suppose. as there isnt too much information in the blue channel, it really only needs to be done on…