On 18 Aug 2013, at 20:09, Tom Davie <tom.da...@gmail.com> wrote:

> 
> On 18 Aug 2013, at 15:03, Gerriet M. Denkmann <gerr...@mdenkmann.de> wrote:
> 
>> I just noticed that the program I use to create Png files creates files with 
>> twice the number of pixels in each dimension.
>> Obviously because since I last used it, I have switched to a Retina Mac Book.
>> 
>> Ok, so I have to fix this program.
> 
> The correct way to fix this problem is to create an image via CGContextCreate 
> and CGContextCreateImage.  When doing this you specify pixel rather than 
> point dimensions, and do not have the issue you’re experiencing.  You detect 
> a retina device by testing scaleFactor as you suggested, it’s just 
> unnecessary here.

I just asked Xcode about CGContextCreate and it told me that there is 
absolutely no information available.
Could anybody help me with some link to some documentation?

Kind regards,

Gerriet.


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