Can't find a way to check image file type.

Can’t find a safe way to get image file type, e.g jpg, png, bmp or other type. I tried get metadata with pyvips.Image.get_fields and pyvips.Image.get("vips_loader")， but worried about its reliablity.

[jcupitt]

I would use something like:

def format(image):
    formats = {
        "jpegload": "JPEG",
        "tiffload": "TIFF",
        etc.
    }
    loader = image.get("vips-loader")
    return formats[loader] if loader in formats else "unknown"

[2h4dl]

Haha, not convinced, but work. Thank you @jcupitt.