Shutter Speed aka (exposure time) , stands for the length of time a camera shutter is open to expose light into the camera sensor - is one of the three pillars of photography, the other two being ISO and Aperture
How to Correct Photos with Lightroom in Under 30 Seconds
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Use a brush to "paint out" the portions of the image that should disappear. The mask itself is white, so it is easy to remember that "white reveals and black conceals". Use a soft black brush to paint out the background.