xmpdf (version 0.2.1)

edit_xmp: Set/get xmp metadata

Description

get_xmp() gets xmp metadata from a file. set_xmp() sets xmp metadata for a file.

Usage

get_xmp(filename, use_names = TRUE)
get_xmp_exiftool(filename, use_names = TRUE)
set_xmp(xmp, input, output = input)
set_xmp_exiftool(xmp, input, output = input)

Value

get_xmp() returns a list of xmp() objects. set_xmp() returns the (output) filename invisibly.

Arguments

filename

Filename(s) to extract xmp metadata from.

use_names

If TRUE (default) use filename as the names of the result.

xmp

An xmp() object.

input

Input filename.

output

Output filename.

Details

get_xmp() will try to use the following helper functions in the following order:

1. get_xmp_exiftool() which wraps exiftool command-line tool

set_xmp() will try to use the following helper functions in the following order:

1. set_xmp_exiftool() which wraps exiftool command-line tool

See Also

xmp() for more information about xmp metadata objects. supports_get_xmp(), supports_set_xmp(), and supports_exiftool() to detect support for these features. For more info about xmp metadata see https://www.exiftool.org/TagNames/XMP.html.

Examples

  x <- xmp(attribution_url = "https://example.com/attribution",
           creator = "John Doe",
           description = "An image caption",
           date_created = Sys.Date(),
           spdx_id = "CC-BY-4.0")
  print(x)
  print(x, mode = "google_images", xmp_only = TRUE)
  print(x, mode = "creative_commons", xmp_only = TRUE)

  if (supports_set_xmp() &&
      supports_get_xmp() &&
      capabilities("png") &&
      requireNamespace("grid", quietly = TRUE)) {

    f <- tempfile(fileext = ".png")
    png(f)
    grid::grid.text("This is an image!")
    invisible(dev.off())
    set_xmp(x, f)
    print(get_xmp(f)[[1]])
  }