Dublin:
Thnx! that last CD-case picture is very good because its as perpendicular as freehand pictures are possible.
What most people miss is that perpendicularity is a must in comparison pictures or its just an approximation level measurement... it gives a feel for the size difference and it is for some good enough. I'm trying to make some mockups and the more precise sizes I get the more realistic will the comparison be...
A sidenote about ocular measurement... to avoid parallax error use biggest zoom one can get, zoom in and place object for measurement as far it needs to be to just fill the whole image. And if its possible, use biggest depth-of-field (apperture setting).
then again no ruler-based ocular measurement is ever as accurate as a pair of average calipers...
