Exercise: Control the strength of a colour
To find a strong definite colour and select a viewpoint so that the colour fills the frame.
As it was harvesting time a large yellow combine harvester was selected as the subject for this exercise. The average exposure setting was found – f5.6 then a sequence of pictures were taken all composed exactly the same but exposed differently from bright, f5.0 & f4.5 to dark, f6.3 & f7.1. All photos were taken at shutter speed 1/320 sec at 38mm on a Nikon D90.
As the series of colours progresses from overexposed to underexposed (as the exposure is reduced), the brightness of the yellow colour changes from bright to slightly dark. The more overexposed photo produces a stronger yellow in contrast to the most underexposed photo producing a duller yellow.
Exercise: Primary and secondary colours
For this exercise it was necessary to find scenes or part of scenes that are each dominated by a single one of the primary ( red, yellow and blue) and secondary colours (green, violet and orange). See the standard colour circle below:
With each colour found the exposure was varied slightly, that is one at the meter reading (correct) exposure then one half a stop brighter and one half a stop darker.
The closest ‘true’ red matching the colour circle is the under exposed photo
The closest ‘true’ yellow matching the colour circle is the over exposed photo
The closest ‘true’ blue sky matching the colour circle is the under exposed photo
The closest ‘true’ green matching the colour circle is the over exposed photo
The closest ‘true’ violet matching the colour circle is the under exposed photo
The closest ‘true’ orange matching the colour circle is the correct exposed photo.
I found it hard to identify which was the true colours that matched the colour circle. The exercise certainly made me look at colours in a different way by noticing the various shades particularly green which in this part of the world in exhibited in multiple shades.