This exercise required me to have an understanding of the Histogram. We will all have seen them on the back of the camera, but what do they mean.
A good description comes from “The essential Lighting Manual” by Chris Weston (isbn 978-2-940378-46-3)
He states that it is:-
A function that provides a bar chart that identifies the distribution of tones across all tonal levels.
Here is an example of a histogram from a Nikon D3
The horizontal axis relates to the tones and the vertical axis shows the quantity of pixels.
This gives the photographer an indication as to how the image was exposed.
This is an example of a histogram and how it would look at the same image when taken
- Correctly exposed
- under exposed
- over exposed.
(Copyright of DSLR User Guide)
I have been asked to take three images
1. Low contrast
2. Average contrast
3. High contrast
I had to then take three images for each of the above , average , over and under exposure.
Here are my Examples
On each of the examples above you can see that the shape of the histogram gives a good indication of what the image will be like.
However many of the books that I have read state that the histogram must be used with caution. If shooting in raw then one writer, Mr Weston, said that the histogram can be wildly
Clipping takes place on the under exposed shots.
I did use the histogram before I looked at this exercise, but this was a valuable project.