Control the strength of a colour
This exercise involves varying the exposure of an image to change the strength of a colour. In essence the colour changes as more or less light is allowed to reflect off the colour and be captured by the camera’s sensor or film. The Exercise asked for 5 images 1/2 stop apart above and bellow correct exposure however as my camera stops at 1/3 increments I have included 7 images. All images are straight jpeg conversions from RAW.
The correct exposure for the image was f8 1/250th AWB ISO 100
At this exposure the colour elements of the yellow door measured as RGB are 220, 182, 2 and the HSB values are 50. 99%, 86%.
Using the central image at f8 as a reference point it is seen that as the Aperture increases towards f5.6 that the yellow changes from a vibrant deep colour to a very light and weak colour. As Aperture decreases towards f11 the yellow changes to a more orange and burnt colour tone.
It has been noted that increasing or decreasing the amount of light captured has an affect on all the colour qualities of Hue Saturation and Brightness. The change in Hue, which is the quality by which we name a colour, shows that light can not only change the strength and intensity of a colour but the actual colour itself.
The RGB and HSB figures ate either end of the exposures were as follows:
RGB – 255, 231, 43 HSB – 53, 82%, 100%
RGB – 169, 128, 0 HSB – 45, 100%, 65%