Exchanging with OpenJPEG developers and searching more on the topic, it
seems that YUV is more often refered to as YCbCr. Wikipedia says:

> typically the terms YCbCr and YUV are used interchangeably, leading to
> some confusion. The main difference is that YUV is analog and YCbCr is
> digital

As for eYCC, I am told this is extended YCC. It seems this is refered as
xvYCC (I really can't find much under "eYCC"). So let's rename it too.

Hopefully I made no mistakes!