Serving Retina Images to the New iPad

Some great digging by Duncan Davidson and Steve Streza: turns out you have to save your JPEGs (that are over 2 megapixels) as progressive for them to be rendered correctly on the new iPad. Davidson:

After reverse engineering the limits and then later being pointed to the documentation about the limits, somebody suggested using a progressive JPEG file based on the observation that the large iPad hero image Apple uses is a progressive JPEG. I’ve not used progressive JPEGs in years, but following that suggestion, I gave it a shot. Lo and behold, it’s indeed the ticket to large JPEG joy on the iPad Retina display.

Interestingly though, Davidson isn’t convinced we should start saving all our JPEGs as progressive.

Published in tools | 09 Apr 2012