The attached test case calls ConvolveOp.filter() on a BufferedImage which
is returned from ImageIO as TYPE_3BYTE_BGR. The test throws an exception as follows :

java ConvolveOpTest
Exception in thread "main" java.awt.image.ImagingOpException: Unable to convolve src image
        at java.awt.image.ConvolveOp.filter(ConvolveOp.java:180)
        at ConvolveOpTest.testConvolveIdentitySample(ConvolveOpTest.java:25)
        at ConvolveOpTest.main(ConvolveOpTest.java:9)