On 21 Jun 2017, at 16:09, Jens Alfke <j...@mooseyard.com> wrote:
> 
> On Jun 20, 2017, at 11:17 PM, Gerriet M. Denkmann <gerri...@icloud.com> wrote:
>> 
>> Assume that I have two NSImages, both with the same size, how can I create 
>> an animated gif which alternates between these two images?
> 
> You might have to use a 3rd party image library to do that; I’ve never heard 
> of animated-GIF (GIF89) encoding being in Mac frameworks.

Can’t you use ImageIO to do that?  See

<https://developer.apple.com/library/content/documentation/GraphicsImaging/Conceptual/ImageIOGuide/ikpg_dest/ikpg_dest.html>

ImageIO definitely supports GIF, and it also supports multi-image file formats; 
there’s an example of creating an APNG, but I imagine it’ll work for animated 
GIF just as well.

Kind regards,

Alastair.

--
http://alastairs-place.net

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