Color problems in Metal

Hi

I am working on color handling in my Metal app. I tried to understand what is said in WWDC2016 Session 605 about wide color but apparently failed. This screenshot shows the problem: I have dropped few drops of "Maraschino", "Tangerine", "Lemon" and "Lime" NSColorPanel colors. While they may appear similar, they really aren't same. Just have a look at Digital Color Meter values for "Tangerine" color in my app. It shows R: 98% G: 68% B: 3%. When I point Color Meter to little square on the left of "Tangerine" name in NSColorPanel it shows R: 100%, G: 50% B: 0%.

I set colorspace for Metal layer:

    NSColorSpace * colorSpace = [ NSColorSpace extendedSRGBColorSpace ];
    [ metalLayer setColorspace: [ colorSpace CGColorSpace ] ];
    [ metalLayer setPixelFormat: MTLPixelFormatBGRA8Unorm_sRGB ];

Take color out of NSColorPanel:

                    NSColor * currentColor = [ [ NSColorPanel sharedColorPanel ] color ];
                    currentColor = [ currentColor colorUsingColorSpaceName: NSCalibratedRGBColorSpace ];
                    tank->setColor(
                        [ currentColor redComponent ],
                        [ currentColor greenComponent ],
                        [ currentColor blueComponent ],
                        [ currentColor alphaComponent ]
                    );

Color is then passed (as 3 floats, I ignore alpha component) to shader rendering to MTLPixelFormatRG11B10Float texture. Texture in question is then rendered to MTLPixelFormatBGRA8Unorm_sRGB drawable. And this is what I get.

I tried experimenting with various colorspace name combinations in both Metal layer and NSColor conversion. Best I was able to produce was result as above (or far worse). What I am doing wrong?

Thanks in advance

Michal