metadata not passed to the writer

[eroux]

We recently discovered an issue on our server that's probably the same as dbmdz/iiif-server-hymir#68 , the problem is that no ICC profile of is written by imageio-jnr. In fact, looking at TurboJpegImageWriter.write, it seems all IIOMetadata is ignored when writing an image. Is there a trick to work around the problem?

[eroux]

In fact the main problem is not directly with IIOMetadata, it's that the ColorModel of the BufferedImage is not used by the writer. So when the writer outputs an image with a custom ICCProfile in the ColorModel, the profile is not embedded and the colors are off. See this function for an example.

[jbaiter]

ICC color profiles are currently not supported (I don't think this is currently documented, but certainly should be!), but I'd gladly accept a PR that adds support for them!