For a different reason, I’ve posted the most complete CGBitmapContext example
I’ve seen anywhere (which is why I posted it). You can see it here
http://www.blinddogsoftware.com/goodies/#DontSpillTheBits
and customize to your needs.
You can ignore the CGLayers, CGImage, and CIImage effects. The bitmap context
creation is what you want to look at.
> On Jun 23, 2017, at 5:11 PM, Graham Cox <graham....@bigpond.com> wrote:
>
>
>> On 24 Jun 2017, at 1:45 am, Gerriet M. Denkmann <gerri...@icloud.com> wrote:
>>
>> the image looks fine, but when I write subData to disk, it has 64 x 64
>> pixels.
>
>
> By making the NSBitMapRepresentation yourself, creating a context for it,
> drawing to that.
>
> If you make it yourself using the long-winded but complete initializer, you
> have total control. Any of the other ‘convenience’ methods do various things
> that you can’t see, are poorly documented, and give unexpected results. Even
> when they work today their implementations change and one day might do
> something else, suddenly breaking your code. I’ve certainly had that happen
> when Retina screen came out for example, and had to go back and do it using
> the long initializer so I got what I asked for.
>
> —Graham
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