EM 1110-2-2907
1 October 2003
Figure 5-7. Pixel population and distribution across the 0 to
255 digital number range. All three plots show the pixel dis-
tribution before and after a linear stretch function (white de-
notes pre-stretch distribution and colored elements denote
stretched pixel distribution). The stretched histogram shows
gaps between the single values due to the discrete number
of pixel values in the data set. The top histogram (red) has a
bimodal distribution. The middle (green) maintains a skewed
distribution, while the last histogram (blue) reveals a normal
distribution. The solid black line superimposed in each im-
age indicates the maximum and minimum DN value that is
stretched across the entire range. Notice the straight lines
that join the linear segment. Image taken from Prospect (2002
and 2003).
5-15
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