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Check image resolution on image file upload

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Hello,

I am wondering whether it is possible to check resolution of an image when it is uploaded using the AJAX uploader form element, and display an error when it fails to meet a minimum? Which hook(s) could I use?

I would suspect you would have to use the wp_get_attachment_image function and run some query to accomplish this.

Preferably I would like to display a notification right after the upload finishes, but before the form is submitted, so I think the image would not yet be an attachment at that point..

Formidable use Dropzone as file upload library. You can start with that. I'm currently looking for ways to detect if there are files uploaded.

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