JPEG vs JPEG 2000 ?
JPEG is a type of lossless compression. A different between those two is the color. When it comes to data compression, JPEG shows worse quality than in JPEG 2000. The different can be seen on the brightness of the color. Other than that, the compression ratios of JPEG is lower than JPEG 2000. In this context, JPEG 2000 provide a bigger chances of compression ratios to change the size of the original colour. JPEG 2000 is known as the latest from the first version which is JPEG.
Resources : 1) http://www.stat.columbia.edu/~jakulin/jpeg/artifacts.htm