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Brightness

➤ Lighten or Darken an image by changing its brightness. The -f flag is used for that, it is a float between (0.0,10.0]

  1. If f>1 then it lightens the image. For example : -f 1.2 increases the brightness by 20%

  2. If 0<f<1 then it darkens the image. For example : -f 0.8 decreases the brightness by 20%

gowall effects br ~/Pictures/girl.png -f 1.2

brightness