PLIST isn't an image
A .plist file stores text data — settings, coordinates, lists — not pixels. There's no image inside to extract, and a picture can't be saved as a PLIST data file.
Looking to turn a PLIST into JPEG? Here's the honest answer — and the conversions that actually work.
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JPG (JPEG) is a lossy raster format that compresses photographs into small files by discarding detail the eye barely notices — the most widely used photo format on the web and in cameras.
JPG opens in every browser, image viewer and editor with no special software.
No — PLIST is a data format, not an image, so there's nothing to convert. You can convert the PLIST data to JSON or XML instead.
PLIST is a text-based data format used for app settings and, with a matching image, sprite-sheet coordinates. It isn't a picture.
A sprite sheet is a .png + .plist pair. Use a texture packer (TexturePacker, Cocos2d) to pack or unpack them together; a single-file converter can't.