batch jpeg editor on commandline

    imgn [output quantity] [file / folder] [--options] [-1] [adjustments] [-n] [adj1,adj2]

• include all images inside nested folders to be processed ''' example: imgn -4 /home/folder/ --train -1 d=lightness... '''

• number between -1 (reduce brightness) and 1 (increase brightness)
• number greater than 0 increases brightness

  example:
      -n b=0.204
      -n b=-0.456
  

• number between -1 (reduce contrast) and 2 (increase contrast)
• number greater than 0 increases contrast

  example:
      -n c=1.55
      -n c=-0.405
  

• luminosity

  0.21 * red + 0.72 * green + 0.07 * blue
  

• average

  (r + g + b) / 3
  

• lightness

  (max + min) / 2
  

  example:
      -n d=luminosity
      -n d=average
      -n d=lightness
  

• weight * red + weight * green + weight * blue
• weights are user inputed as floats

  example:
      -n df=[red]_[green]_[blue]
      -n df=0.20_0.70_0.10
  

• a number between 0 and 1
• a higher number (closer to 1) recovers more highlights

  example:
      -n h=0.502
  

• a number between 0 and 1
• a higher number (closer to 1) recovers more shadow

  example:
      -n s=0.880
  

• [border pixel size] _ [r] _ [g] _ [b]
• r, b, b values between 0 and 255

  example:
      -n bx=200 (default black border)
      -n bx=200_255_255_255 (white border)
      -n bx=200_255_50_50