Playing with Core Image, Core Filters and the like on iOS So far I do not think there is anything interesting to look at; Just a test home project;
Printing description of printableRect (LEITZ): (CGRect) printableRect = origin=(x=9.52440929, y=3.5999999) size=(width=230.399994, height=998.787414) continuous 91mm (91mm = width=230.399994 + x=9.52440929 == 960dots) k = 1:4.16666666666667