@speeder

That is my whole point, your picture is not pretty good - it can be fine in 32bit but not fine in 16 bit. Unless the fuschia that you think is there is exactly the right RGB value.

Do a get pixel of a fuschia area while in 16bit colour and my guess would be it will not be $ff00ff.

I have implemented hundreds of different delphix programs across a huge array of hardware for over 7 years now. My suggestion is that you need to look for your problems in your own workings rather than trying to fault delphix.