Exercise: Tungsten and Fluorescent Lighting (Digital Camera)
Objective: By using different types of lighting coupled with camera white balance settings, I have aimed to demonstrate the variation in the colour of different types of light and how the camera settings can be used to compensate for them.
I completed the comparison test at the start of this exercise and noted that the room appeared yellow in the first observation as did the outside in the second observation. I’m not sure if this is what was expected but there was a definite yellow cast outside from residual light of the sunset on a clear evening. While I am prepared to accept that the eye could see what the brain expects, I’m not sure how objective this test can be.I set my camera’s meter to ISO100 and the range of shutter speeds at full aperture (f3.5) was from 1/5 to 1/10 second. Not fast enough to hand hold.
I had to change the lamps to tungsten for this exercise and produced these three images using these camera settings:1/1.6s f5.6 18mm ISO100 tripod mounted
|8139: White Balance: Auto|
|8140: White Balance: Daylight|
|8141: White Balance: Incandescent (Tungsten)|
Including the lamps in the image has introduced burnt out highlights in all of them. The Auto setting has produced an almost identical image to the incandescent image with the exterior showing very blue. The daylight setting is very orange but the outside scene appears to be normal daylight with just a hint of the late evening orange mentioned earlier.
For the second part of the exercise, I put the energy saving CFL lamps back into their holders. My camera has 5 different fluorescent white balance settings which include: white fluorescent, warm white fluorescent, cool white fluorescent, day white fluorescent and daylight fluorescent. I have shown images for Auto white balance, the fluorescent setting which shows the most accurate colour balance and an edited version in an attempt to correct it.