He put his baseball cap on backwards to take the picture.
Because the hiragana ends with an う sound, you know this word is a verb. The kanji itself means photograph. When you make that into a verb, you are doing a photograph, aka making it become to take a picture. It can also be to film as well. Really anything to do with a camera.
Think of the reading like you do the meaning to take a photograph. You "take" all these things, and how do you say "to take" in Japanese? It's 取る, aka とる, which happens to be the same reading!