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Skin deep

Skin deep

Q Step 3: Blue

The shortest wavelengths (blue) hardly penetrate the skin For this reason, the blue component looks very graphic with no depth to the skin. In general, ou can use the blue component as an excellent hump map. It is far superior to using the full color image. The blue does have both surface diffuse and specular components—so we can't use it as i sole guide to specular, but at least it is almost devoid of any sub-surface scattering component.

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O SteP 4: Green

The mid wavelengths (green) penetrate well intu u subcutaneous layer of skin. This is the layer just under the surface. Carefully compare this image to the blue channel. You can see lots of variation (mottled patterning) in this layer of skin. You won t see large blood vessels in this layer, but there is a lot of local blotchiness. Note that the reflected (bump detail) and scattered light contributions are roughly equal for the mid wavelengths.

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