1466 Photoshop Curve File Within Adobe Photoshop, curves allow you to adjust the entire tonal range of an image. Curve files can be saved and stored as presets. 1 Digital Preservation Department / The National Archives 23 Sep 2014 A curve file begins with 0x0001 or 0x0004 depending on the version in use (http://www.adobe.com/devnet-apps/photoshop/fileformatashtml/). A signature based on these sequences would be highly prone to clashing with other formats, so identification is currently based on extension only. 23 Sep 2014 fmt/667 PUID acv File extension atf File extension