Re: Image scaling

FROM : Adam Knight
DATE : Sat Jan 05 00:45:50 2008

On Jan 4, 2008, at 4:25 PM, Adam Knight wrote:

> 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.  I'm working with too many images for this to be good.  Also, 
> this method drops the file metadata entirely (EXIF, etc.) and 
> doesn't appear to give me the chance to add it back in.


I take this back -- even this method produces slightly blurry scaled 
images.  Is there anything in the system that can make a sharp, proper 
scaled image?

Examples:
   http://www.bssware.com/~ahknight/good_scale.jpg (Image uploaded to 
Flickr in full size, the resulting image at 500px wide)
   http://www.bssware.com/~ahknight/bad_scale.jpg (Scaled using either 
CG or CI to 500 pixels wide)


Adam Knight
Co-Founder; CTO
Barton Springs Software