You're kidding, aren't you? No. I took that photo in the garden with my own equipment Maybe it's a compliment that it could be on a cover of such a popular film or book I respect artist's work and I wouldn't make a screenshot of it without permission Never
Oh, it's not the cover to the movie, it's just a couple frames in the mid-section of the movie. I don't exactly remember what comes before or after the scene (I have a hunch telling me it's Lupin teaching Harry the patronus charm), but there's about 10 seconds where you're outside Hogwarts and the Dementors are flying around killing all the flowers with their cold-death-like air. The camera then focuses in on this stalk of flowers (that look exactly like the one's you've photographed) and you see them wilting and being covered in frost.