A DESCRIPTION OF THE REQUEST :
I can see a couple of problems here with the documented exceptions:

(1) If w or h is Integer.MAX_VALUE an IllegalArgumentException IS thrown, but you can get the exception for a lot of other inputs also...I'm wondering if the exception occurs when w * h is greater than Integer.MAX_VALUE (see for example the similar exception in the SampleModel constructor), but I'd have to look at the source code to know (and I won't do that, as I'm a contributor to GNU Classpath);

(2) An IllegalArgumentException is documented for dataType, but there is no dataType argument.

JUSTIFICATION :
The specification should be complete and accurate.