Science - ericsimages
Lumanance (black) and RGB data from the spectrum of a modified Canon 40D (clear glass filter modification).  

Note the dip in the peak of the luminance.  This is due to the absorbance of the brown-orange stained emulsion from the potassium dichromate bleaching solution.

Lumanance (black) and RGB data from the spectrum of a modified Canon 40D (clear glass filter modification).

Note the dip in the peak of the luminance. This is due to the absorbance of the brown-orange stained emulsion from the potassium dichromate bleaching solution.