Comment 1 for bug 1406171

Hi Terry,

you found very fast the only issue which remained (at least which I know).
I thought that someone who is using 16 bit image will not use jpeg as output format. So I left this issue out.
Changeset feaf1a349739 provides fallback for some typical case (mostly to 8 bit for jpeg).
Some exotic conversion are left out. Let's wait if someone complains ;-)