On Jan 15, 2015, at 1:02 AM, Ryan Schmidt wrote:

> optipng and pngcrush are popular programs for minimizing the size of pngs.

Also, consider whether using a different image format would help. png and jpeg 
are somewhat old formats by now. Newer formats include webp and bpg:

https://developers.google.com/speed/webp/

http://bellard.org/bpg/

Browser support for these formats isn't as good as png and jpeg, but if you can 
serve webp or bpg images to those users whose browsers support them, and fall 
back to png or jpeg when needed, that can still help you reduce your bandwidth 
and make your site faster for some users, and it will get better over time as 
more users upgrade to newer browsers.


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