“Making of Varga ” by Paul Tosca Another thing you could do is to overlay two normal maps inside photoshop , i have seen a lot of people actually setting the blend mode to overlay and call it final …. this is not quite a good method and i will show you why in the next image ; lets say we want to overlay the normal map in the right on top of the left one ; you can see how the blue channel is looking for each map and how it should look for the combined image …but when setting the mode to overlay because the blue channel is almost white it will completely wipe out any detail in the blue channel and the composite normal map will look wrong.
Below is the final composite map when set to overlay ; we are entirely wiping the information about the normal component so the overlay mode for blending is a NO NO NO 🙂
A better way to combine them is to set the red and green channels to overlay and the blue channel to multiply … now how in the world i will do that … well … duplicate the second layer ( the layer that was supposed to be set to overlay mode ), one layer will be set to overlay, the other with multiply , now , for the layer set on overlay i should neutralize the information in the blue channel by selecting a neutral gray (128 128 128) and by filling the blue channel with this color , that will be ctrl+3 ( to go to blue channel) and alt+backspace ( to fill it with neutral gray … assuming the FG color will be 128 128 128 ), this layer should now look like this when viewed single
For the second layer set to multiply i should neutralize the red and green channels in respect to multiply blending mode ( that will be to fill them with white ) , so set white as FG color and ctrl+1 ( to go to red channel ) and alt+backspace to fill with white , same for green ctrl+2 and alt+backspace ; the second layer should look like below when viewed single
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