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Because it strips any meta information contained in the file which reduces file size. It can also losslessly optimize the image. See here for details (I've writ

by CWIZO 14y ago

Because it strips any meta information contained in the file which reduces file size. It can also losslessly optimize the image. See here for details (I've written about it a short while ago): http://hancic.info/optimize-jpg-or-jpeg-images-automatically-with-jpegtran http://hancic.info/optimize-jpg-or-jpeg-images-automatically...

radley 14y ago
It sounds great in theory but the previous example only saved < 200 bytes. That's not really optimization, that's overkill.
- CWIZO 14y ago
  Not if you have many images on the same page. Then id adds up.
  - radley 14y ago
    If you place 1800 images on a page, you'll save enough bandwidth to now have 1801.
jseliger 14y ago
In response to Radley, who said: * It sounds great in theory but the previous example only saved < 200 bytes. That's not really optimization, that's overkill.* That's a fair point, but if you've got a site that's getting hundreds of thousands or millions of views, or a large number of thumbnails, the one-time effort to shrink image size might be worth it.