![]() ![]() While some APP markers are in fairly common use, a few are not used at all. These are defined as APP0-APP15 and are 0xFF 0圎n. The JPEG file format specification also allows for what it calls custom application markers. There are many other markers for specific purposes that have been reserved for JPEG itself within its own file format. Similarly, the End of Image (EOI) marker is 0xFF 0xD9, which means we have found the end of a JPEG image. For example, a JPEG image starts with the Start of Image (SOI) marker, which is 0xFF 0xD8, so we know that if we see that sequence, we have found the start of a JPEG image. ![]() What this means is that JPEG format reserves the 0xFF byte for "markers" for the start of each "chunk" and each chunk has a specific structure. The JPEG file format is a chunked, structured binary file format. It all starts with modifying the JPEG file format in ways not really conceived of before. It has been several years since the Amazon Cloud Drive service API went from "okay" to "completely non-functional." Since I haven't used the service for quite a while, I figured it would be an okay time to reveal how I used to use Amazon Prime Photos as an unlimited storage backup service. ![]()
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