Re: NSImage > trapezium...

FROM : Cathy Shive
DATE : Sun Mar 23 15:38:21 2008

Luca, I am sorry for being snippy.  I automatically assumed you were 
referring to an NSImage when all you said was image.  Many many 
apologies!!

Glenn has you on the right track :)

Again, good luck and sorry *blush*
Cathy


On Mar 23, 2008, at 3:10 PM, glenn andreas wrote:

>
> On Mar 23, 2008, at 8:54 AM, Cathy Shive wrote:

>> On Mar 23, 2008, at 2:14 PM, Luca wrote:
>>

>>> Hello. Do you know how can I transform a rectangular image in a 
>>> trapezium?

>>
>> Seriously?
>>
>> You aren't going to be able to distort your bitmap like this with 
>> NSImage and there is no ready-made CIFilter to do this distortion 
>> that I'm aware of.  If I'm wrong about that, then that's the way 
>> to go.  But,  I think you've gotta do your own pixel pushing for 
>> this one.
>>

>
> Actually, the CIPerspectiveTransform will do this perfectly (you 
> even just give it the resulting four corner points)
>
> You can't do that will an affine transform though (since 
> perspective is, by definition, non-affine), so you'll need to use 
> CoreImage.
>
>
> Glenn Andreas                      <email_removed>
>  <http://www.gandreas.com/> wicked fun!
> quadrium | flame : flame fractals & strange attractors : build, 
> mutate, evolve, animate
>
>
>
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