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Showing content from http://libvips.github.io/libvips/API/current/method.Image.history_printf.html below:

Vips.Image.history_printf

int
vips_image_history_printf (
  VipsImage* image,
  const char* format,
  ...
)

Add a line to the image history. The format and arguments are expanded, the date and time is appended prefixed with a hash character, and the whole string is appended to the image history and terminated with a newline.

For example:

vips_image_history_printf(image, "vips invert %s %s",
    in->filename, out->filename);

Might add the string

"vips invert /home/john/fred.v /home/john/jim.v # Fri Apr 3 23:30:35 2009\n"

VIPS operations don’t add history lines for you because a single action at the application level might involve many VIPS operations. History must be recorded by the application.

This method is not directly available to language bindings.

format

Type: const char*

printf()-style format string.

The data is owned by the caller of the method. The value is a NUL terminated UTF-8 string.

...

Type: 

Arguments to format string.

Type: int

0 on success, -1 on error.

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