Progressive JPGs: A New Best Practice

» Posted by on Jan 2, 2013 in Blog | Comments Off

There are two kinds of JPGs in this world: baseline and progressive. Progressive is just better. Ann Robson shows us why.

Experimenting locally with a throttled bandwidth, an 80K progressive jpeg beats a 5K baseline jpeg (the same image, downsized) to the page in Firefox on Windows. This should blow your mind. Sure, the progressive jpeg’s first pass is low-resolution, but it contains as much information, or more, as the small image. And if you are zoomed out, perhaps on a mobile device, you will not notice it’s low-res. That’s responsive images working for us right now!

And that’s just one reason. Sadly, her research suggests better than 9/10 JPGs on the internet are baseline. Fairly small sample size, but still.

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