hi,
Are you sure you don´t see banding because the monitor is not calibrated as well?
So maybe you have a gradient with very few levels for example 0-5% and 4 inch width and that smooth shade tecnology in the RIP (postscrip Level 3) won´t work?
if, then It depends from the situation in the layout, but maybe this is a suitable workaround for your issue:
1
copy to photoshop (rescept your color workingspaces! do not convert, keep values)
2
in Photoshop:
place as pixel, save and made a copy
3
in the copy: filter: noise
and than smoothfilter: comand+F (gausscher Weichzeichner/blur?) try above 10 pixels or so much you need
4
might be, you have to repair the starting and the ending points with curves in Photoshop (Gradationskurven) down to zero up to former value 5 in the example.
(With info about Lab you can controll comparing with the saved as pixel placed step before. Differences "around" DeltaE 1 is okay.)
Hope this helps,
Ulrich