How can i create a mask of grays?

Hi
i did learn how create a saturation mask (a mask that contains the colors)
how can i create a mask with the grays ?
can i do it? how can i create it ?
the only way i can thing it's use a color selective adjustament layer and set to +100 black every sliders outside grays
but i don't think it's a mask with all the Grays
thanks

If you start out with, say, this image in Lab:
Then duplicate the layer and set Blend If, in both the a and b channels, to 123 - 133. That layer will then look like this:
You see you have all the neutrals from black to white, but not the saturated colors. You can load transparency here as a selection the normal way - ctrl+alt+2, or ctrl-click the L channel. Save the selection and you have your mask.
How much fuzziness you want in the neutrals is determined by where you set the Blend If sliders. You can also split the sliders with the alt key for a softer transition. Here it includes 5 values either side of strict neutral.

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Hi Lindalnci
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