Converting normal map values to vectors; numerical errors

[lorentzo]

Perturbed normals are encoded in normal map pixels as RGB vectors. To obtain a perturbed normal conversion from RGB to unit vector is required. The problem appears when one (or more) of RGB channel has a value of 128 which should exactly be 0 in converted vector. But in this case, converted vector not 0 but close to 0, more specifically: 0.003921 or -0.003921.

Below is the normal map baked in Blender which has this specific cases:

For example, pixel value of (128, 128, 255) should be converted to (0,0,1) but it it has values of (0.003921, -0.003921, 0.999985).

[imSanko]

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