These images were made using the program ‘Audacity’, usually an audio editing program, in a process known as ‘Databending’ that takes the image down to it’s raw data which allows it to be read as an audio file, before putting it back together again after using a technique for editing audio.
Here is a little guide to creating glitch images in audacity:
Coincidentally, the artist Gordon Cheung had two pieces that used pixel sorting in the RA Summer Exhibition.
An artist I found when researching pixel sorting, who seems to be the king of the medium so far is Kim Asendorf. Here is an image from his ‘Mountain Tour’ series in 2010.