PhotoDemon’s Smart Blur tool allows you to selectively blur smooth or edge regions of an image. Radius controls the strength of the blur, while Threshold controls how smooth (or edged) a region must be to be considered for blurring. Unlike other photo editors, the threshold value is not absolute – pixels near the threshold are automatically feathered, to prevent any unsightly lines or marks in regions near the threshold value.
Like all PhotoDemon tools, a dedicated command bar allows you to save and load custom presets, randomize parameters, and reset to default values. Last-used settings are automatically saved and restored, and all changes provide a real-time preview (no click or mouse button release required).