Being an engineer (who has struggled through graphs for most of his academics) I decided to learn more about histograms before I move ahead with my photography practice. This is essential for the exposure and tone (yes , yes there are a lot of photographic terms that I should know , I will write it down in a blog post ), So I Google it out and found and interesting video about the same. I started to experiment with my camera and the images and its histogram are shown in this blog post.
Basically, Histogram represents the distribution of data. Now in our case , the data is a pixel.So, histograms shows us the distribution of pixels on an axis of tone
The left side of the horizontal axis represents the black and dark areas, the middle represents medium grey and the right hand side represents light and pure white areas. The vertical axis represents the size of the area that is captured in each one of these zones. Thus, the histogram for a very dark image will have the majority of its data points on the left side and center of the graph. Conversely, the histogram for a very bright image with few dark areas and/or shadows will have most of its data points on the right side and center of the graph..
Read more about Image histograms at Wikipedia
This is an interesting video which will tell you more about the histograms.
Now I tried two random shots (histograms attached)
This is the first shot that I took – underexposed
Improvement in next 3 shots (hope to improve in 2 shots only )