title: GPUImage memory warnings
body: <p>I am facing a strange problem while applying GPUImage Filters on image. I am trying to apply different filters on an image but after applying 10-15 filters it gives me memory warning and then crashes. 
  Here is the code:</p>
  
  <pre><code>sourcePicture = [[GPUImagePicture alloc] initWithImage:self.m_imageView.image smoothlyScaleOutput:YES];
  
              GPUImageBrightnessFilter *bright=[[GPUImageBrightnessFilter alloc]init];
              [bright setBrightness:0.4];
              GPUImageFilter *sepiaFilter = bright;
  
              [sepiaFilter prepareForImageCapture];
              [sepiaFilter forceProcessingAtSize:CGSizeMake(640.0, 480.0)]; // This is now needed to make the filter run at the smaller output size
              [sourcePicture addTarget:sepiaFilter];
              [sourcePicture processImage];
              UIImage *sep=[sepiaFilter imageFromCurrentlyProcessedOutputWithOrientation:3];
  
              self.m_imageView.image=sep;
              [sourcePicture removeAllTargets];
  </code></pre>
  
  <p>If anyone gone through the same problem please suggest. Thanks</p>