IS_IMAGE Special type validators

This validator checks if a file uploaded through the file input was saved in one of the selected image formats and has dimensions (width and height) within given limits.  It does not check for maximum file size (use IS_LENGTH for that). It returns a validation failure if no data was uploaded. It supports the file formats BMP, GIF, JPEG, PNG, and it does not require the Python Imaging Library.

requires = IS_EMPTY_OR(IS_IMAGE())

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