This is documentation for Mathematica 7, which was
based on an earlier version of the Wolfram Language.

# ImageHistogram

 ImageHistogram[image] plots a histogram of the pixel levels for each channel in image. ImageHistogram[image, n]uses n levels for each channel. ImageHistogram[image, n, {min, max}]puts all values into n bins between min and max.
• For a three-channel image, ImageHistogram by default displays the channels using red, green and blue.
• ImageHistogram supports an Appearance option which determines the detailed appearance of the histogram. Possible settings include:
 "RGB" show RGB channel values and overlapping colors "Separated" make separate histograms for each channel "Stacked" stack values for each channel "Transparent" show channels overlapping using transparency
• ImageHistogram[image, n] by default takes the first histogram bin to start at channel value 0 and the last one to end at 1. Channel values below 0 or above 1 are shown in the first and last bins, respectively.
• ImageHistogram[image, n, {min, max}] takes the first bin to start at min, and the last bin to end at max.
• ImageHistogram[image, n, All] gives n equally spaced bins, extending over the complete range of values in each channel.
Show the histogram of an RGB image:
Use additive colors to represent overlapping regions of the histograms:
Show separate histograms for each color channel:
Stack the color channels vertically:
Show the histogram of an RGB image:
 Out[1]=

Use additive colors to represent overlapping regions of the histograms:
 Out[1]=

Show separate histograms for each color channel:
 Out[1]=

Stack the color channels vertically:
 Out[1]=
New in 7