-a,--all
Show all fields. Fields are displayed to be convenient for humans to read, so binary data, for
example, is summarized rather than simply printed.
-fFIELD,--field=FIELD
Print the value of FIELD from the image header. Fields are printed in a way suitable for programs
to understand, so, for example, binary data is base64-encoded and printed as a stream of
characters.
The special field name getext prints the VIPS extension block: the XML defining the image
metadata. You can alter this, then reattach with vipsedit(1).
You can use multiple "-f" arguments to print the values of many fields.