The bluebox filter


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The bluebox sets the colours transparent, which are situated within the upper and lower slider-values (RGB). Thus the so-called bluebox method is possible, the background colour becomes transparent when drawing a screen sample in the transparency mode.
'Bluebox'
If the button 'Bluebox' is selected, all blue tones, which correspond to the intensity of the right lower slider at least, are set to the background colour (transparency).