To View A Specific Channel In The Histogram - Adobe PHOTOSHOP CS2 User Manual

Histogram palette with all channels displayed and statistics hidden

To view a specific channel in the histogram

If you chose the Expanded View or All Channels View of the Histogram palette, 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 document's individual channels, including color
•
channels, alpha channels, and spot channels.
• Depending on the image's color mode, choose RGB, CMYK, or Composite to view a composite histogram of all
the channels. This is the default view when you first choose Expanded View or All Channels View.
• 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.
In the All Channels View, choosing from the Channels menu affects only the topmost histogram in the palette.
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