OpenImageIO/oiio — pull request #436 by lgritz (2012-09-25 19:08:45+00:00)
Title: ImageBufAlgo::compare and idiff improvements.

Change the IBA::CompareResults failure and warning counts to imagesize_t so
they can't overflow int for very large images.

Have IBA::compare() give a sensible error (rather than an ASSERT) if the
images aren't float.

Add a careful unit test for IBA::compare() to imagebufalgo_test.cpp.