TurboJpeg current implementation only talks RGB. Also using Turbojpeg should be an option, not a "library is there, we use it"

[DiegoPino]

What?

If you look at the TurboJpeg processor code, you will notice there is no Colorspace detection and there is always an assumption source is RGB. That means turbojpeg fails on CMYK. Java2D does not.

Also, turbojpeg is used as the default output processor when the libraries are present, making configuration changes (e.g swapping the JPEG processor for one that is known to work with CMYK) impossible. I think a more proper way would be to either check if JPEG is already mapped to TurboJpeg or have an extra setting that allows the output processing of e.g /default.jpeg to a config choice