Hope you have checked Part-1 of this series, where we discussed the basic reasoning of the thought around better understanding of Histograms in Digital SLR Cameras and Photoshop like applications. If not, click here and come back to this article.
Histogram is one of the best tools in Digital Cameras; from simple point-n-shoot cameras to Digital SLRs. Most of the recent cameras have the capability of showing Histrogram on LCD screen they have on back side. Most of the cameras also give an option to see photograph clicked an corresponding Histogram. Many cameras also have capability of combined histograms for RGB and individual histograms for Red, Green and Blue separately. At times individual histograms are more useful. How? We will discuss that.
Histogram is a simple graph that displays where all of the brightness levels contained in the scene are found, which is from the darkest to the brightest. These values are shown across the bottom of the graph from left (darkest) to right (brightest). The vertical lines (height of points ) shows how much of the image is found at any particular brightness level. This count is actually number of pixels.
Before we dive deep into the concept of Histogram, I would like to share some examples with sample photographs and will leave you here for guessing it's meaning and how a histogram is related to a photograph. Then we shall move into the discussions about RGB Histogram and Individual Colored Histograms. Let's check out these images...
I know I haven't written anything about these photograph. Just look at the photograph and corresponding Histogram and try to find out a relation. No need to worry even if you fail to understand, because we shall discuss these in detail in upcoming post on this blog.