On Nov 11, 2013, at 4:44 PM, Maxthon Chan <xcvi...@me.com> wrote:

> What I stumbled upon is that you should use vector images in PDF format and 
> the system will scale it for you.

Can, may, but not “should.”

Lines that are supposed to be one point wide cannot remain one point wide when 
the art is scaled. For a lot of images that’s unacceptable, so the best thing 
to do is still to create a bunch of bitmap representations at the necessary 
sizes and use the correct one at draw-time. For example, create an .iconset 
with your bitmaps which then gets turned into an .icns by Xcode for you.


--
Seth Willits




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