This exercise aims to show how a colour appears to change as the exposure is changed. Several images were taken of the same painted metal door; the shutter speed was held at 1/80 sec (and ISO at 400) but the aperture - having initially been automatically set by he camera at f4, was manually opened up and then stopped down to produce a range of images from over-exposed to underexposed. Overall the 5 images cover 2 stops
It is clear when scanning through the images that as the exposure is reduced, the blue colour of the door becomes deeper and richer. The hue remains the same - it is blue - but the brightness and saturation change.