Re: Image scaling
Re: Image scaling
- Subject: Re: Image scaling
- From: "Shawn Erickson" <email@hidden>
- Date: Fri, 4 Jan 2008 16:56:49 -0800
On Jan 4, 2008 2:25 PM, Adam Knight <email@hidden> wrote:
> I think I'm missing something here.
>
> I need to take an image and scale it (very cleanly) down while keeping
> the metadata. The source is a JPEG file on-disk (typically from a
> digital camera). The destination is an NSData object in memory that
> is JPEG-encoded with the same metadata.
>
> I tried this using CIImage and a CILanczosScaleTransform filter then
> using NSBitmapImageRep's initWithCIImage method. This worked very
> well and made a great image, but it looks like Apple's initWithCIImage
> code leaks a whole copy of the image outside of my reach.
Consider using vImage (supports "Lanczos3" and "Lanczos5").
<http://developer.apple.com/documentation/Performance/Conceptual/vImage/vimage_geometry/chapter_6_section_2.html#//apple_ref/doc/uid/TP30001001-CH207-TPXREF103>
-Shawn
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