Easy JPEG Transcoding

Fri, 07 Oct 2011 07:00:00 +0000

2011-10-07 : Amundsen-Scott South Pole Station

The Independent JPEG Group is responsible for a C-based JPEG library that is used by lots of software. Their library distribution also includes the very useful binary executables “cjpeg” and “djpeg”. When combined, they can be used to transcode JPEGs. I’ve used these programs gainfully to transcode JPEGs to 14% of their original size with no visible change in picture quality.

To prove the point, I’m including the difference between the original seven megabyte version and the transcoded version. A completely black image means there are zero differences. In this one you might be able to make out faint shades of color:

Jpeg on galvanist

Easy JPEG Transcoding