I appreciate the suggestions to use a third party app. However, I have way too many third party apps including full on PS that I feel this should be able to be accomplished in Photos on a Mac and I'm just not using the right settings. This is what I have done. Here is my Oriole with minimal light level adjustments.
His beautiful black eyeball is difficult to discern even on a very large well-calibrated monitor. So, let's just take the eye out:
Up close, you can see the color differentiation around it. At first, I went into markup, drew a circle around it and tinted jut the border of the circle with a lighter shade of black. No good. I don"t want a "drawn" eyeball. It is a strict line and not even "feathered." So took an eyedropper from Selective Color, which even when zoomed in, is too large to pick up much of that different color. Tried anyway, applied the action with adjusted hue, saturation, luminance and range and not much difference to the eye:
but it did alter the background color:
So, if there are any Photos pros out there who know how to do this, a response would be appreciated or maybe Apple can come up with a way that doesn't make me have to use PS. I have a lot of beautiful birds with black eyes.
Thank you,
Old Rookie