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Progressive JPEGs - Printable Version

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Progressive JPEGs - GreenGecko - 06-06-2013 08:35 AM

Been working in tandem with ngx_pagespeed to get a new site tuned, and am a bit annoyed seeing that big old F underneath the progressive heading.

Any chance that you can mimic the pagespeed functionality of ignoring images < 10KB in your scoring?

EDIT. Sorry Patrick, That came over as being far grumpier than I had intended!

RE: Progressive JPEGs - pmeenan - 06-06-2013 08:45 AM

Yeah, I can see about not including files < 10KB in the overall grade (but still flag them if you go look). Any chance you have a link to a test result just so I can make sure nothing else is going on? I assume there are no larger JPEG's on the page, otherwise they should negate the < 10KB ones.

RE: Progressive JPEGs - GreenGecko - 06-06-2013 10:28 AM


(not my code lol)

RE: Progressive JPEGs - pmeenan - 06-06-2013 11:59 PM

The vast majority of those are over 30 KB: http://www.webpagetest.org/result/130605_Q8_1MHC/2/performance_optimization/#progressive_jpeg

It looks like it is mostly meta-data with a bunch of stuff from the Camera and Photoshop: http://www.webpagetest.org/jpeginfo/jpeginfo.php?url=http%3A%2F%2Ftest.spywebshop.nl%2Fmedia%2F360%2F7278-ip-netwerk-camera%2F360_assets%2F7278%2Fimages%2FSKU-7278-1.jpg

RE: Progressive JPEGs - pmeenan - 06-07-2013 12:01 AM

Oh, and for added measure, they have thumbnails embedded in the thumbnails ;-)

Better lossless optimizations that can strip out most of the meta-data but maintain copyright (so it is safe to apply universally) is next on my list to nail down.

RE: Progressive JPEGs - pmeenan - 06-07-2013 06:24 AM

ok, it is now only warning for and grading JPEGs > 10KB