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Here is another approach that can also work.

1) Add Threshold Adjustment Layer above your image and set the Blend to Color Dodge.  Set slider value to the higher "L" point desired using the conversion from my prior posts.    This will make all parts of the image white above the Threshold value

2) Add another Threshold Adjustment Layer on top and set the Blend mode to Mulitply.  Set the slider value to the lower "L" point desired using the conversion from my prior posts. This will make all of the parts of the image below this Lower Threshold value black

3) Using the Magic Wand tool set to 0 tolerance and point sample and in the Add mode, click on the solid black area  and the solid white area consecutively.  Then invert this selection.  Now you have a section representing all values in the desired L range.

Following is the Layer Panel with the image at the point where I just selected the full black and full white areas.

Hope this gives you another option to consider

John Wheeler

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