Unit 4 Image Enhancement: 1 of 14

This starts the fun part. From here on you will have a lot of hands-on practice learning how to make old photographs look almost like new. And you can use the same procedures to correct or enhance new images too.

Probably the most important indicator of image quality, particularly in photographs, is dynamic range. 

Key Point: Dynamic range is the range of tonal difference between the lightest light and darkest dark of an image. 

The higher the dynamic range in an image, the more tones or colors and thus the more detail you can see.  In a typical image, the widest dynamic range would be present if the lightest tones are "white" and the darkest are "black."  Remember in our discussion of color, we learned that there are no colors lighter than white (255,255,255) or darker than black (0, 0 ,0).