On 14/06/2009, at 1:09 PM, Pierce Freeman wrote:
I will say before hand that I don't really want to dive into Quartz,
etc. at
the moment and simply want to stick with the "image basics".
Anyway, I am
making a fullscreen app that has window with a NSImageView that
fills the
screen. I only say this as it may change how to address this issue
(not
quite sure about that). Anyway, I am looking to add a quick blur to
the
NSImage before I insert it into the NSImageView. I have not found any
sample code that does this without going into some other framework,
and am
wondering if anyone here would have any suggestions.
While it does mean delving into a new API, Core Image is your friend
here and it's by far the easiest way to blur an image. It's not very
hard. Here's how to get a blurred NSImage from a source NSImage:
NSImage* sourceImage = [NSImage imageNamed:@"YourImage"];
CIImage* inputImage = [CIImage imageWithData:[sourceImage
TIFFRepresentation]];
CIFilter* filter = [CIFilter filterWithName:@"CIGaussianBlur"];
[filter setDefaults];
[filter setValue:inputImage forKey:@"inputImage"];
CIImage* outputImage = [filter valueForKey:@"outputImage"];
NSRect outputImageRect = NSRectFromCGRect([outputImage extent]);
NSImage* blurredImage = [[NSImage alloc]
initWithSize:outputImageRect.size];
[blurredImage lockFocus];
[outputImage drawAtPoint:NSZeroPoint fromRect:outputImageRect
operation:NSCompositeCopy fraction:1.0];
[blurredImage unlockFocus];
Make sure you link against <QuartzCore/QuartzCore.h> and include the
QuartzCore framework.
It's more efficient if you create the CIImage directly from a file
using -imageWithContentsOfURL: and then draw it using the CIImage -
drawAtPoint:fromRect:operation:fraction: method rather than using
NSImage objects but if you need to use an NSImageView then you don't
have too many options.
--
Rob Keniger
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