Basic Core Image filtering and Image I/O

gistfile1.txt

framework "Quartz"

input_a = "path/to/a/file"
input_b = "path/to/a/file"
output = "path/to/a/file"

#load images using Core Image (could have also used Image I/O
h_path = NSURL.fileURLWithPath(input_a,false)
forground_image = CIImage.alloc.initWithContentsOfURL(h_path)

b_path = NSURL.fileURLWithPath(input_b,false)
background_image = CIImage.alloc.initWithContentsOfURL(b_path)

#set up filter
filter = CIFilter.filterWithName("CIHardLightBlendMode")#CIOverlayBlendMode
filter.setDefaults()
filter.setValue(forground_image, forKey:"inputImage")
filter.setValue(background_image, forKey:"inputBackgroundImage")

#run the filter
output_image = filter.valueForKey("outputImage")

# get a CIContext to process the images
#Creates a Core Image context from a Quartz context
ci_context = CIContext.contextWithOptions(NSGraphicsContext.currentContext, options:nil)

#generate a CGImageRefs (Switch to Core Graphics)
cgimg_ref = ci_context.createCGImage(output_image, fromRect:output_image.extent)

#save to the file system using Image I/O 
myImageDest = CGImageDestinationCreateWithURL(NSURL.fileURLWithPath(output,false), "public.jpeg", 1, nil)
CGImageDestinationAddImage(myImageDest, cgimg_ref, nil)
CGImageDestinationFinalize(myImageDest)