[OS X TeX] Line thickness in TeXShop preview (and Preview.app) on Tiger

[Bruno Voisin]

It seems that in TeXShop's preview window on Tiger (hence with  
version 2.02) the thickness of lines, as produced by underlining or  
in tables, varies: some lines have (what looks like) one pixel  
thickness, while others have two pixels thickness.

This appears to be connected with the magnification: at 100% or 200%  
all lines have the same thickness, but when the PDF document isn't  
displayed at an integer multiple of its original resolution, for  
example with 150% magnification, the thickness starts to vary. Local  
rounding artifacts when mapping from the document resolution to the  
screen resolution, when the two are no integer multiples of each other?

Preview.app exhibits the same behaviour, thus it seems to be  
connected with Apple's routines used by TeXShop. I was accustomed to  
this behaviour in OzTeX, but don't remember seeing it in TeXShop  
before Tiger.

Screenshots here <http://homepage.mac.com/bvoisin/FileSharing4.html>.  
(Sorry for the "-zip.zip" extensions, I've no idea of how it got  
there and tried everything I could think of to get rid of it, with no  
luck.)

Bruno Voisin
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