Brighten images, using opacity attribute supported in css3

• Will be brighten when the mouse is on a image.
  

  弘前 ねぷた

  三内丸山 縄文遺跡

  イブキトラノオ 2006/8, 栂池自然園

  
  
• Brighten with p or div.
  (ffox, crome, opera, safari, edge20. except IE)

  Neputa in Hirosaki

  Neputa in Hirosaki

  
  
• --> Another sample : Changing brightness by button or by slide bar.