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).
The essence of a histogram is best illustrated by the method of its construction. 1  Choose the number of classes; this will be an aesthetic judgement based on the data. 2  Choose the class size. 3  Choose the class marks (centers of the classes) or class boundaries (endpoints of the classes). 4  Draw the histogram.