I am making several (large) photobooks (large meaning about 500 pics per book). This time I am using Fotobuch from Germany; beforehand I used Blurb, but the lay-outs are rather old fashioned and difficult to change. In any case, I have to shrink all these pics from each about 15 MB down to 5 MB maximum. I'm working under 0SX and could use Photoshop CC, Apple's own Preview, Imagewell, ...but is there a quality difference between the resulting 5 MB photos????