My wife loves to take pictures. A lot of pictures. Just recently her MacBook Air started to warn her that its hard drive is out of space. We had to do something. Looking at our options, we wanted to archive some old pictures and keep only the newest ones on her computer. Another option was to move her entire iPhoto library to external drive. However, none of it sounded awesome.
I remembered I read a while ago about the app called JPEGmini that takes original photos and makes them lighter while keeping the original resolution and the quality. The description on the App Store confirmed it:
Put your photos on a diet with JPEGmini! JPEGmini reduces the file size of your photos by up to 5X, while keeping their original resolution, quality and JPEG format. With JPEGmini you can optimize all your photos to free up valuable hard drive space, and share full-resolution photos with your friends much faster.