Click button to select brush type. Circle indicates current brush size, opacity and hardness. Select desired correction type   Select preset to set optimal parameters for each particular case.   Select Advancedà to set parameters manually. To adjust brush size, drag slider. Place brush over birthmark (or any small-sized dark defect) and click. To view original image, hold . To undo / redo changes   To undo / redo last strokes, click / .   To cancel all changes, click .