title: Apply absolute contrast and brightness using Imagemagick
body: <p>I have a tool which allows to justify contrast and brightness of image online using CSS3 filters. Thus I got two values of brightness and contrast from 0 to [inf] which means "1" is no change in brightness/contrast.</p>
  
  <p>Next step, I need to apply these changes to image physically using Imagemagick. I've digged a ton of docs but not found how I can apply these 2 values to image.</p>
  
  <p>It is relatively simple way to apply brightness and contrast corrections to image file using command-line Imagemagick?</p>