Dan-San Abbott of
the Aerodrome Forum identified that aircraft as Dr.I 477/17 and says this photograph was taken at Léchelle on March 26, 1918. He also specifically says it is not Dr.I 425/17, the machine in which the Red Baron was killed.
The black and white versions of these photographs are well known to me. I have seen them many places. For example, Dale Titler in the hardcover edition of The Day the Red Baron Died (Bonanza Books, New York 1970) identifies this as one of von Richthofen's triplanes, but says it is not the aircraft in which he was killed. The Red Baron flew several different Fokker triplanes (not all of them red) towards the end of his career, although most of his victories were scored in Albatros biplanes.
Alex Imrie in his book, The Fokker Triplane (London 1992), says that this is Fokker Dr.1 425/17. He points out an inverted v blemish on the fabric underneath the cockpit where the fuselage dope came off (the blemish isn't visible in this colorized version of the photograph). Later in his book (photograph #116) is another view of this aircraft painted with Balkan (straight) crosses instead of the earlier Cross Patée of this photograph. Alex Imrie identifies the aircraft of photograph #116 as Fokker 425/17 in its final ( italics mine-HvH) state of decoration.