I am a newcomer to Povray and trying to land in a wooden three textures:
diffuse, bump, specular.

With the first two have no problem:

pigment{ image_map{ jpeg "suelo.jpg" interpolate 2}}
normal { bump_map{ jpeg "suelo_bump.jpg" bump_size 0.8}}
finish { diffuse 0.8 specular 0.5 ambient 0.100000 roughness 1/50 }

But not to speculate that the texture is not uniform brightness,
ie grayscale darkest areas sparkle less or nothing.

I've searched the documentation and have not found or been able to find anything
respect.

Does this function Povray? How?

Thanks and best regards to all.

Tony

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