Hallo,
ich kenne mich damit nicht aus,
aber wenn du nur die Endung ändern willst, hilft vielleicht das hier von der Seite, die du gepostet hast:
Note: Boards with the new firmware (below) will save pictures as '.jpg' files with the following format: "[name of trigger]###.jpg". If your board saves files as '.txt' they are still jpeg encoded, you simply need to change the extension, but if you like you can download the new source sketch and upload it to your board using the 'Arduino 5V/16Mhz w/ AtMega328' board profile.
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