jpeg image color gets drastically changed after just ImageIO.read() and ImageIO.write()

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Your problem is that ImageIO is misinterpreting the YCbCr data in your JPEG as RBG data. The relevant Java bugs are 4712797 and 4776576, which Oracle wrongly claims were fixed in Java 1.4, but in reality still afflict some Java 5, 6, and 7 JVMs.

In a project I work on, we’ve dealt with this problem by loading a specially-constructed test JPEG with a single black pixel to see if ImageIO loads it properly. If the pixel comes up green, then ImageIO is misinterpreting the image data, so when we load JPEGs later and we detect the sort of JPEG which causes the problem, we also apply a color correction. (The kind of JPEG which triggers the problem in JVMs which exhibit it has a particular kind of subsampling and no JFIF marker.)

Here’s some LGPLv2-licensed code which deals with the problem. The need for code like this to work around dozen-year-old bugs when the whole rest of the world manages to load JPEGs properly is one of the reasons I want Java to die in a fire.

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