The fourth one changes the vertical size to fit in the area most of the histogram but cutting long peaks produced by outliers. The third one changes its vertical size to fit the whole histogram in the area. The second one makes it use a logarithmic scale. The first button makes it use a linear scale (the default). These buttons allow you to control the visualization of the histogram. These input boxes do the same as the output levels slider, but allow you to finetune the values. This is a slider that you can use to quickly change the output black and white points. These input boxes do the same as the input levels slider, but allow you to finetune the values. This is a slider that you can use to quickly change the input black and white points and gamma. This area shows the histogram for the active channel. If you use the second mode you can modify the levels for each channel independently and you can change the active channel by selecting it in the list that appears at the right side of the buttons. With these two buttons you can switch between “lightness only” and “per channel” levels adjustment. The default shortcut for levels filter is Ctrl + L. A histogram is displayed to show you the tonal distribution. You can even set an output and input range of tones for the image. This filter allows you to directly modify the levels of the tone-values of an image, by manipulating sliders for highlights, midtones and shadows. The strength at which this filter is applied. Burn is named after a trick in traditional dark-room photography that gave similar results. This will apply the effect on the highlights only. The effect will apply to mostly midtones. The effect will mostly apply to dark tones. Dodge is named after a trick in traditional dark-room photography that gave the same results. The Adjustment filters are image-wide and are for manipulating colors and contrast.
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