Unsharp mask tool
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This tool controls the unsharp mask filter, which enhance small scale details and levels the large scale brightness variation (lunar terminator, Jupiter "soft" edge...).
The "radius" slider controls the threshold between large scale contrast, which will be weakened and small scale contrast which will be enhanced. The "gain" slider controls the amplification of small scale contrast. The "gradient" button, when checked, limits the processing to the calculation of the unsharp gradient, without incorporating it in the original image. The bottom progress bar indicates the progress of the processing, it is useful only for large images.