If it's a simple linear gradient you may be able to calculate rgb values.
You can also post it on a DrawingCanvas and read pixel data from it.
If you are making a color picker, check out this page:
https://howtoconstructdemos.com/hsv-color-picker-tool-c3p/
nice i saw your ragdoll templer,did you use many rope to make hand and leg so IT looks like
mesh transform?