Changing colorspaces in Goal-C

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How can I convert from system color house to calibrated RGB house.Please attempt to add adjustments to the next code:

    NSColor *MyColorAtScreenCoordinate(CGDirectDisplayID displayID, NSInteger x, NSInteger y) {
    CGImageRef picture = CGDisplayCreateImageForRect(displayID, CGRectMake(x, y, 1, 1));
    NSBitmapImageRep *bitmap = [[NSBitmapImageRep alloc] initWithCGImage:picture];
    CGImageRelease(picture);
    NSColor *colour = [bitmap colorAtX:0 y:0];
    [bitmap release];
    return colour;
}

I received the code from this put up.
I discovered a solution for swift right here ,I’m fairly new to swift and even the docs didnt assist

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