Ah, the wonder of technology. WNYC radio station is having a photobomb contest involving the British actors Ian McKellan and Patrick Stewart. The radio station conveniently provided photos of the actors with the background removed. You would save the photo, select the white background then invert the selection, and finally copy and paste the new selection, which is just the two actors, into any photo you wish. Not too long ago I had some free time and took many photos at foot races. For the contest, I used one from the PPTC Cherry Tree 10-Miler on President's Day weekend 2013. Appropriate enough because the race took place in Prospect Park and Mr. Stewart himself supposedly lives somewhere in Park Slope.
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