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Is there a good way to see what format an image is, without having to read the entire file into memory?
Obviously this would vary from format to format (I’m particularly interested in TIFF files) but what sort of procedure would be useful to determine what kind of image format a file is without having to read through the entire file?
BONUS: What if the image is a Base64-encoded string? Any reliable way to infer it before decoding it?
Most image file formats have unique bytes at the start. The unix
filecommand looks at the start of the file to see what type of data it contains. See the Wikipedia article on Magic numbers in files and magicdb.org.