120 Manipulating Images
The vertical Y axis is the relative pixel count at each of the levels on the X axis
described above. The higher the graph is at any level, the more pixels reside at
that particular level. Remember that this histogram could refer to a Red, Green,
Blue, RGB or luminance channel.
A crosshair cursor can be moved around the histogram, displaying the pixel
count for the color level that your cursor is currently placed at. For example, the
tab above shows the cursor at color level 131, which has a count of 4459 pixels.
You can choose to view the histogram for an individual Red, Green or Blue
channel, All colors, or the composite of the three, the RGB channel. Luminance
(or lightness) can also be shown.
To view a specific channel:
Click the Tab Menu button at the top right of the tab to reveal a flyout.
To change to a different channel, e.g. RGB, pick a channel from the list or
display statistics by checking Show Statistics.
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