Graphics Programs Reference
In-Depth Information
Figure 3-1. A histogram represents pixel brightness in image data
You can look at an image and tell whether it's too bright, too dark, etc. Viewing the histogram will show you
how the image data is distributed within the image. This information is important for making the proper tonal
correction, as you'll see in more depth in the upcoming “Tonal Corrections Using Levels” section of the chapter.
The following examples demonstrate how the image tone distributes the data in a histogram.
Overexposed (too bright) : Most of the image data is in the mid-range to the
bright pixels in the histogram (Figure 3-2 ).
Figure 3-2. Most of the data is in the brightest range
 
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