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Level Button
By clicking on the Level button, the Level dialog box will appear.
The Level dialog box includes several
useful tools for you to check the
Colour level information of the image
and adjust the image quality. A
description of each component in the
dialog box and how they work to
affect the image follows.
Colour Channel box
Use the Colour Channel box to select a Colour channel to adjust.
This will allow you to adjust the histogram property of each Colour
channel respectively.
Histogram
A Histogram displays the distributing status of
dark and bright pixels in an image. The x-axis is
divided into 256 equal portions, representing the
brightness level of 0 to 255. The y-axis is used to
represent the quantity of pixel in each brightness
level. A comparison of two images and their
histograms follows: