TIFFWarning invokes the library-wide warning
handler function to (normally) write a warning message to
the stderr. The fmt parameter is a
printf(3S) format string, and any number arguments
can be supplied. The module parameter is interpreted
as a string that, if non-zero, should be printed before the
message; it typically is used to identify the software
module in which a warning is detected.
Applications that desire to capture control in the event
of a warning should use TIFFSetWarningHandler to
override the default warning handler. A NULL
(0) warning handler function may be installed to suppress
error messages.
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