Take a photo with green, yellow, blue and red in, then convert to black and white, first at default settings, then emulating each of the coloured filters.
Fujifilm X-E1 with XF 27mm f/2.8 lens; Adobe Lightroom 4.
This old wooden abacus had all the right colours so made a good subject.
Using Lightroom I did a straight ‘neutral’ B&W conversion as seen below.
The Green Filter preset made the green lighter, but also made the yellow and red look lighter; only the blue came out looking darker.
The Yellow Filter preset made the yellow beads almost white, and the red slightly paler than the default version, but rendered the green and blue as quite dark.
The Blue Filter preset surprised me the most, as it made everything apart from the blue beads much darker than all the other versions. The effect was so extreme that I went back and checked a couple of times, and also looked at other students’ submissions of this exercise. It seems that this can happen with a blue filter.
The Red Filter preset had the expected effect of washing out the red beads, and also made the blue beads in particular look darker.
What I’ve learned:
This was an interesting exercise. I’ve used B&W presets before, not particularly based on colour filter presets but more by trial and error until I achieve the effect I’m looking for. This exercise has filled in some of the gaps on why a certain B&W conversion has the effect on colour tones that it does, and hopefully will inform my B&W shooting and processing choices in future.