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I am very new at photoshop and I am trying to learn how to select an object that has fuzzy edges against a background whose color varies but is distinguishable from the object. Think of a fern bush (mostly green and brown stems) against a background that is a reddish wall of a barn. Some of my more experienced photoshop friends tell me to just carefully trace out each leaf and stalk, which is way too time consuming. I can test the colors of the pixels near the edges and I see that the red compononent makes a marked jump from the object to the background, and, I believe their must be some algorithmic method whereby I could designate a matrix of colors that constitute the background (or inversely, the object), and then I should be able to move a small circle around the visible edges and let the program figure out which pixels fall either within the object or within the background based on the color limits I specify.
I want to believe photoshop already has this feature available, but, the learning curve is immense, so, if anyone can jumpstart me please advise.
I want to believe photoshop already has this feature available, but, the learning curve is immense, so, if anyone can jumpstart me please advise.

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