Function nannou::image::image_dimensions

pub fn image_dimensions<P>(path: P) -> Result<(u32, u32), ImageError> where
    P: AsRef<Path>, 

Read the dimensions of the image located at the specified path. This is faster than fully loading the image and then getting its dimensions.

Try io::Reader for more advanced uses, including guessing the format based on the file's content before its path or manually supplying the format.