![]() Not to say that there’s no structure, it’s just harder to discern in compressed image data. ![]() We can see where some data ripe for glitching is in the above example where the file changes from structured, to seemingly random data. We need to locate the meat of the file, the raw image data, we can usually tell the raw data apart from the header and other important structural data by it’s garbled nature. The header contains information that is required for the image to be displayed at all and should be left intact (though feel free to experiment). The first bytes of a JPG file contain what’s know as the file header. Get started by making a copy of a JPG and open the copy in a hex editor - never edit the original file. You can see a JPG open in a hex editor in the image below. ![]() Most hex editors display both hex and text (also known as ASCII) in the same view but in separate columns. Editing the file using hex rather than text allows greater flexibility since we’re no longer restricted to text characters (which are each represented by two hex digits). Hex editors allow us to view and edit the bytes of a file using hexadecimal. If you don’t have a hex editor installed there are some freeware options list at the bottom of this post.
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