Exercise 25: Colors into BW Tones

The purpose of this exercise is to demonstrate how color is turned into black-and-white tones.  The brief calls for shooting a single image of a subject of red, green, blue and yellow, and then in post processing applying those same color filters to observe the shift to tones.

Adobe Lightroom preset color filters were used on the image above to to produce the images above.  For contrast, a fifth image was produced using Lightroom's preset Low Contrast B&W filter.

What can be observed here is each filter accentuating the light of its own color, while blocking the light of others.  

• Blue filter blocks out most red and a lot of yellow
• Red filter blocks out quite a bit of blue and allows in quite a bit of yellow
• Green and yellow filters seem to produce more neutral images overall

The filters also produced greater contrast, as can be observed in comparison with the Low Contrast B&W filter.  

When thinking about the brightness of color, the results seem a bit odd.  If green and red are equally bright, why do the red and green filters produce such different tones?  Red seems to produce more contrast than green.  

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