How to make the eyedropper sample non-transparent color of a transparant layer?

I have an image of a flower I am trying to paint.

I put the flower as the top layer at 50% opacity to use as a guide.

Then I am trying to paint on a layer below that.

I would like to be able to use the eyedropper on the original image but for it to pick up the full color and not the %50 opacity version of the color.

I saw this done in a demo but can't seem to figure it out.

I tried setting the eyedropper options to "All layers no adjustments" but it's still only picking up the lighter version of the color.

Any suggestions?