HAColorFinder.m

//wait on everything to be completed
dispatch_barrier_async(weakMe.concurrentQueue, ^{
    
    //Get the highest count amont the worker results
    NSArray* allCounts = [workerResults allValues];
    NSSortDescriptor* countSort = [[NSSortDescriptor alloc] initWithKey:@"count" ascending:NO];
    NSArray* sortedCounts = [allCounts sortedArrayUsingDescriptors:@[countSort]];
    HAColorComponentsCount* colorComponentCount = [sortedCounts firstObject];
    HAColorComponents *components = colorComponentCount.components;
    
    NSColor *dominantColor = [NSColor colorWithCalibratedRed:components.red/255.f green:components.green/255.f blue:components.blue/255.f alpha:1.0];
    
    NSTimeInterval time = [[NSDate date] timeIntervalSinceDate:startTime];
    
    if (completion) {
        dispatch_async(dispatch_get_main_queue(), ^{
              completion(dominantColor, time);
        });
    }
});