Question

i have a problem with the Core Image filters. The code is pretty simple. I create a new project "single view app"; add CoreImage framework.. (here do i ned to add any header file?) add an uiiamgeview...and set an image to its.image. However, when i tried the following code, it did not show any effect. could you plz give me a hand with the mistake or error? btw, I m running the program under simulator 5.0 with Xcode 4.2.1 Thanks in advance.

CIImage *backgroundciImage = self.sourceImageView.image.CIImage;
CIContext *context = [CIContext contextWithOptions:nil];

//set the filter
CIFilter *filter = [CIFilter filterWithName:@"CIGammaAdjust"];
[filter  setDefaults];
[filter setValue:backgroundciImage forKey:@"inputImage"];
[filter  setValue:[NSNumber numberWithFloat:3.0f] forKey:@"inputPower"];

//get the output image
CIImage *outputImage = [filter valueForKey:@"outputImage"];
self.sourceImageView.image = [UIImage imageWithCGImage:[context createCGImage:outputImage fromRect:outputImage.extent]];

Answer 1

The following Code Works for me., and

CIImage *image = [filterTemp valueForKey: @"outputImage"];    
CIContext *context = [CIContext contextWithOptions:nil];
CIFilter* filterBW = [CIFilter filterWithName:@"CIGammaAdjust"];
[filterBW setValue:image forKey:@"inputImage"]; 
[filterBW setValue: [NSNumber numberWithFloat:2.00f]  forKey: @"inputPower"]; 
CIImage *resultImage = [filterBW valueForKey: @"outputImage"];
self.sourceImageView.image = [UIImage imageWithCGImage:[context createCGImage:resultImage fromRect:resultImage.extent]];

页: 1 您可以宣布CIImage*backgroundciImage在相应的档案中。

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