Re: Image processing in Cocoa
Re: Image processing in Cocoa
- Subject: Re: Image processing in Cocoa
- From: "Christian Giordano" <email@hidden>
- Date: Wed, 24 Sep 2008 15:56:35 +0100
Thanks Mike, I can't use NSImage (guess why) but a subset. Btw, the
problem I have is that I have a view which contains an image. I would
like to draw in the image, not in the container view so I need to
provide to the draw method the image context. Is this a good approach
or all the drawing should happen in the view context? Should I extend
the image view and handle the routing internally?
Thanks, chr
On Wed, Sep 24, 2008 at 11:08 AM, Mike Abdullah
<email@hidden> wrote:
>
> On 24 Sep 2008, at 10:50, Christian Giordano wrote:
>
>> Hi guys, is there some good tutorial around about how to manipulate
>> bitmaps in Cocoa?
>>
>> I would be interested on:
>>
>> - copy portion of image over another with a mask (this should be
>> pretty straight forward with quartz2d)
>
> [[NSImage alloc] initWithSize:]
> [image lockFocus]
> [sourceImage drawAtPoint:point fromRect:imagePortionRect operation:operation
> fraction:1.0]
> [image unlockFocus]
>
>>
>> - apply threshold
>> - apply effects like blur
>
> Core Image is your friend
>>
>>
>> Not sure if some of this, like the blur, is recommended to do from an
>> higher level instead of doing it pixel by pixel. In case of the
>> latter, how to get the bytearray with all the pixels info?
>>
>> Thanks a lot, chr
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