Convert Byte Array to image in Java - without knowing the type

Question

Sounds simple right? Use

ImageIO.read(new ByteArrayInputStream(bytes));

Here\'s the wrinkle. For some reason it is detecting a jpeg as a b

Answer 1

Haven't played with ImageIO in a awhile, and have not tested this, but I seem to recall something like this working. (since you say you know your file is a jpg and not a bitmap, I am using that information to help find the right loader).

String inFormat = "jpg";

Iterator inReaders = ImageIO.getImageReadersByFormatName(inFormat);

...

nextInReader.setInput( iis );

Answer 2

For the reference you can have a look at wikipedia, you can find the header of the different formats there.
http://en.wikipedia.org/wiki/Graphics_Interchange_Format
http://en.wikipedia.org/wiki/BMP_file_format
http://en.wikipedia.org/wiki/JPEG

Answer 3

Is the BMP reader the only one returned by getImageReaders()? Maybe you get more than one and can make a choice based on that.