Have you tried the Ping method in ImageMagick?

Ping() is a convenience method that returns information about an image without having to read the image into memory. It returns the width, height, file size in bytes, and the file format of the image. You can specify more than one filename but only one filehandle:

...

This a more efficient and less memory intensive way to query if an image exists and what its characteristics are.

In reply to Re^3: Testing JPEGs for validity (windows) by Anonymous Monk
in thread Testing JPEGs for validity (windows) by kosmarnik

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