PHYSICS 109 Chapter Notes - Chapter 8: Complementary Colors, Film Base, Color Photography
Document Summary
Subtractive color mixing applies to overlapping colored filters and color photography. It is essential for understanding mixing of pigments in paints or inks and for color printing. A filter absorbs part of a light that is shining into it and transmits the remainder. Transmittance (t) : fraction of incident light transmitted through the filter. If a filter has a t=0. 6, the filter absorbs 40% and transmits 60% of the light. If light has i = 4, transmitted light is 4 x 0. 6 = 2. 4 units. Transmittance of a filter is different for different wavelengths of light. Neutral density filter : a gray filter, transmittance is same for all wavelengths. This incident light is a mixture of red and green, it has no blue. For the same incident light, there is a filter in front of it which allows: There was no blue in the incident light so that makes no difference for the filter.
