osi model presentation layer formatting

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So I've been reading for some time about this model. And I couldn't find an answer for the following question: I know that one of layer 6s jobs is to decide on a format for the data that it received from layer 7. For example .jpg. How does it know what format to add? Thanks !

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ISO's OSI Model is a reference model for communication (theoretical). According to it's guideleines, the TCP/IP protocol suite is developed (practical). Also, Presentation and Session layers are eliminated from actual TCP/IP protocol suite implementation. That being said, the answer to your question is, that one of the application layer protocol just passes the *.jpg file to transport layer as pure binary "data".