Steve, thank you - I just tested your recommendation - it appears to work well. Doug, I just got your recommendation and will look into CICrop and CILanczosScaleTransform, and CGImageRef documentation on creating images of a particular size. I'm in fact about to run out to a Cocoaheads meeting, so will get back to this in the AM maybe with more thoughts as well and will post again. Thank you both.
On Thu, Dec 11, 2008 at 2:44 PM, Steve Christensen <puns...@mac.com> wrote: > On Dec 11, 2008, at 5:43 AM, Glenn Bloom wrote: > > Can anyone recommend a best practice for resizing an image to reduce its >> size in terms of both bytes and visible dimensions, retaining the new >> smaller image and eliminating the original from memory? In how I go about >> this now, I am concerned about memory and efficiency. >> > > How about something like this? > > NSImage* oldImage = GetSomeImage(...); > NSSize newSize = GetDesiredNewSize(oldImage, ...); > > NSImage* newImage = [[NSImage alloc] initWithSize:newSize]; > > [newImage lockFocus]; > [oldImage drawInRect:NSMakeRect(0, 0, newSize.width, newSize.height) > fromRect:NSZeroRect operation:NSCompositeCopy fraction:1.0]; > [newImage unlockFocus]; > > [oldImage release]; > > > And depending on how important the resized image quality is, you may also > want to do the following just before the drawInRect call: > > [[NSGraphicsContext currentContext] > setImageInterpolation:NSImageInterpolationHigh]; > > _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
