Research the causes of related medical symptoms such as: 1  Eye. 2  Eye symptoms (5412 causes) 3  Eye disease. 4  Eye disorder. 5  Eye problem (5412 causes) 6  Eye pain (475 causes) 7  Itch (1068 causes) 8  more symptoms...Â».
How to read the Histogram. A histogram is a graphical representation of the pixels exposed in your image. The left side of the graph represents the blacks or shadows, the right side represents the highlights or bright areas and the middle section is mid-tones (middle or 18% grey).
We begin this process by finding the range of our data. In other words, we subtract the lowest data value from the highest data value. When the data set is relatively small, we divide the range by five. The quotient is the width of the classes for our histogram. We will probably need to do some rounding in this process, which means that the total number of classes may not end up being five. When the data set is relatively large, we divide the range by 20.