Getting JPEG resolution without decoding the image?

Here is some code which could help you get the data you want.

I don't know about ALL JPEG files, but you will need to handle the two common file formats for JPEG. Since JPEG is a compression method and not a file format, the world at large has developed a few ways of storing JPEG image data in files. The two you are most likely to encounter are JFIF and EXIF.

The above code covers JFIF, but doesn't handle EXIF. These two are largely incompatible but both are JPEG, so you'll need to detect and handle if you are using header information, as they defer.

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