Climbing CFData memory usage when using Core Image filters

Question

I'm having a problem with too much allocated memory. My app alloc mem reaches up to 100MB! And yes... i'm using ARC. most of memory allocated is by CFData(as i understand it is CoreImage filters). After applying filter to image, CFData allocated memory goes up by ~1.3mb and does not deallocate:

The code looks like this:

+(UIImage*)BWFilter:(UIImage *)imgFX
{
    CIImage *sourceImage = [[CIImage alloc] initWithImage:imgFX];

    CIImage *blackAndWhite = [CIFilter filterWithName:@"CIColorControls" keysAndValues:kCIInputImageKey, sourceImage, @"inputBrightness", [NSNumber numberWithFloat:0.0], @"inputContrast", [NSNumber numberWithFloat:1.1], @"inputSaturation", [NSNumber numberWithFloat:0.0], nil].outputImage;
    CIImage *output = [CIFilter filterWithName:@"CIExposureAdjust" keysAndValues:kCIInputImageKey, blackAndWhite, @"inputEV", [NSNumber numberWithFloat:0.7], nil].outputImage;

    CIContext *context = [CIContext contextWithOptions:nil];
    CGImageRef cgiimage = [context createCGImage:output fromRect:output.extent];
    imgFX = [UIImage imageWithCGImage:cgiimage];

    if (cgiimage) {
        CGImageRelease(cgiimage);
    }

    return imgFX;
}

The memory usage doesn’t go down after a memory warning, so it should not be a cache issue.

Answer 1

I ran your code on a sample project (with ARC) and it does not give any leaks nor extra allocations. CFData is not essentially related to CIFilter subclasses but to the CIImage. Problem is somewhere else.