Ajust Levels
APlus Viewer implements two types of way to adjust color levels: one is "Auto Level", this will adjust color levels according to the color of images automaticlly, the second is manually
Below shows the Level Adjust Dialog
The Levels adjustment can be used to alter the color range (or "exposure") of an image, including gamma adjustments, on a channel-by-channel basis. Most adjustments performed using levels consist of changing a pictures input and output white point, black point, and grey point. The white point of an image is the brightest color that appears in the image, while the black point is the darkest color that will appear in an image. The grey point represents the average color of the entire image.
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