Megan

Thanks R C-R, I will give that a try too, wow everybody is teaching me something new so grateful for all the help.

Hi,
It’s not easy to explain with my « poor » English but here is a step by step .
 
First for Highlights (TC1)
- shift/cmd/click on the layer thumbnail in the layer palette  for create a selection. Then in the Pixel selection, right click and create a spare channel, rename it (for me TC1)
 
Second for Highlights 2 (TC2)
- on spare channel TC1, right click load to Pixel alpha. With the pixel layer selected in the layer palette, shift/cmd/click on it to make a selection, then go to the pixel selection, right click and create a new spare channel rename it (for me TC2)
 
for other highlights … repeat the second step …
 
For Shadows (TF1)
- Right click on the spare channel TC1, choose load to Pixel selection and invert the selection.
Then right click on the Pixel selection choose create a spare channel, rename it (TF1)
 
Second for Shadows 2 (TF2)
- Right click on the spare channel TF1, choose load to Pixel alpha; then on the pixel alpha, right click and choose create a mask layer; on the alpha channel, right click and choose create a spare channel, rename it (TF2 in my case) and delate the mask created in the layer palette … ouf (lol)
 
For the next Shadows 3 and others, repeat the step Shadows 2 ..
 
I think there is a simplest way with the intersect add and subtract with or from pixel selection ..?
 
Good luck !!! :)  
 
and the result :
graduate.tiff