Adobe Photoshop CC 2014 v.14.xx - Manual (Page 412)

Mean
Std Dev (Standard deviation)
Median
pixels:histogram display ofPixels
Level
View a specific channel in the histogram
If you chose the Expanded View or All Channels View of the Histogram panel, you can choose a setting from the Channel menu. Photoshop
remembers the channel setting if you switch from either Expanded View or All Channels View back to Compact View.
Choose an individual channel to display a histogram of the channel, including color channels, alpha channels, and spot channels.
Depending on the color mode of the image, choose RGB, CMYK, or Composite to view a composite histogram of all the channels.
If the image is RGB or CMYK, choose Luminosity to display a histogram representing the luminance or intensity values of the composite
channel.
If the image is RGB or CMYK, choose Colors to display a composite histogram of the individual color channels in color. This option is the
default view for RGB and CMYK images when you first choose Expanded View or All Channels View.
In the All Channels View, choosing from the Channels menu affects only the topmost histogram in the panel.
View channel histograms in color
From the Histogram panel, do one of the following:
In the All Channels View, choose Show Channels In Color from the panel menu.
In Expanded View or All Channels View, choose an individual channel from the Channel menu and choose Show Channels In Color from
the panel menu. If you switch to Compact View, the channel continues to be shown in color.
In Expanded View or All Channels View, choose Colors from the Channel menu to show a composite histogram of the channels in color.
If you switch to Compact View, the composite histogram continues to be shown in color.
View histogram statistics
By default, the Histogram panel displays statistics in the Expanded View and All Channels View.
1. Choose Show Statistics from the Histogram panel menu.
2. Do one of the following:
To view information about a specific pixel value, place the pointer in the histogram.
To view information about a range of values, drag in the histogram to highlight the range.
The panel displays the following statistical information below the histogram:
Represents the average intensity value.
Represents how widely intensity values vary.
Shows the middle value in the range of intensity values.
Represents the total number of pixels used to calculate the histogram.
Displays the intensity level of the area underneath the pointer.
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