Some suggestions.

Paint the inside of the white cap black and compare the
effect on the outside surface to unpainted one. That's
sub-surface scattering.

Figure out the tonal mapping or ICC profile of your camera.
POV-Ray output is gamma corrected linear. I bet the camera
output is something different.

Do the out of frame scene geometry and colors match the
real scene? 


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Kari Kivisalo

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