How do I create NSColor instances that exactly match those in a Photoshop UI mockup?

NSColorSpace *sRGB = [NSColorSpace sRGBColorSpace];

CGFloat components[3] = { 1.0, 1.0, 1.0 };
NSColor *sRGBRed = [NSColor colorWithColorSpace:sRGB components:&components count:3];

NSColor *calibratedColor = [sRGBRed colorUsingColorSpaceName:NSCalibratedRGBColorSpace];