Have a quick look at the coverage report, @ruebot. Is it important to test for the event that those partial coverage if-statements evaluate to false? Just trying to get a sense of our testing standards.

It'd probably be good to test those, but I wouldn't say it's a high priority.

I can't think of a way to get to:

            if (image != null) {

Since getImageReaders returns all registered ImageReaders that claim to be able to decode the supplied input, we only get a reader when the encoded image bytes string is valid. But if the bytes string is an image and we enter the if (readers.hasNext()) {} block, the image = reader.read(0) should never be null.

I think test coverage is virtually complete with my latest commit.