title: GPUImageMultiplyBlendFilter
body: <p>I devlop an app, where I can apply overlays on a custom image.</p>
  
  <p>I have this code. But every time I'll run the app it crashes.
  I hope someone knows what I have to do.</p>
  
  <p><strong>Code:</strong></p>
  
  <pre><code>    NSString *filename = @"Overlay1.png";
  
  GPUImageMultiplyBlendFilter *overlayBlendFilter = [[GPUImageMultiplyBlendFilter alloc] init];
  GPUImagePicture *pic1 = [[GPUImagePicture alloc] initWithImage:imgView.image];
  GPUImagePicture *pic2 = [[GPUImagePicture alloc] initWithImage:[UIImage imageNamed:filename]];
  
  [pic1 addTarget:overlayBlendFilter];
  [pic1 processImage];
  [pic2 addTarget:overlayBlendFilter];
  [pic2 processImage];
  [overlayBlendFilter useNextFrameForImageCapture];
  
  
  UIImage *blendedImage = [overlayBlendFilter imageFromCurrentFramebufferWithOrientation:imgView.image.imageOrientation];
  
  NSDictionary *filteredDictionary = [[NSDictionary alloc] initWithObjectsAndKeys:blendedImage, @"filteredImage", filename, @"filename", nil];
  
  [filterNames insertObject:filteredDictionary atIndex:0];
  </code></pre>