I am reading an animated GIF image through ImageIO.read() method. This method returns me the first image frame available in the input stream. I am creating a TypeSpecifier out of this buffered image. I am getting the WBMP Image Writer SPI and calling canEncodeImage(rendered img) as well as canEncodeImage(type specifier). I expect these methods to return false since the given image is not a single-band bilevel image. But these methods return 'TRUE' claiming that WBMP writer would support this image.

But when I write this image using the WBMP Writer, I am getting an exception saying WBMP writer supports only single-band bilevel image. This is incorrect. SPI.canEncodeImage() should properly notify this when the writer does not support it.

This is reproducible on Tiger as well as Mustang on all platforms.

I have attached a sample test. Execute the sample test as follows:
java WBMPWriteTest kiwi.gif

If you see 'true' value returned by both the 'canEncodeImage()' methods and an exception being thrown by the image writer, bug is reproduced.