Note that not all groups are deletable, and that the JPEG APP14 'Adobe' group is not removed by default with -All= because it may affect the appearance of the image. A tag name of All is equivalent to * (except that it doesn't require quoting, while arguments with wildcards do on systems with shell globbing), and is often used when deleting all metadata (ie. When specified with wildcards, 'Unsafe' tags are not written. The wildcards * and ? may be used in tag names to assign the same value to multiple tags.

The preferred group in JPEG and TIFF-format images is the first group in the following list where TAG is valid: 1) EXIF, 2) IPTC, 3) XMP. If no group name is specified, the tag is created in the preferred group, and updated in any other location where a same-named tag already exists. TAG may contain one or more leading family 0, 1, 2 or 7 group names, prefixed by optional family numbers, and separated colons. ^= is used to write an empty string instead of deleting the tag when no VALUE is given, but otherwise it is equivalent to =, but note that the caret must be quoted on the Windows command line. += may also be used to increment numerical values (or decrement if VALUE is negative), and -= may be used to conditionally delete or replace a tag (see 'WRITING EXAMPLES' for examples). += and -= are used to add or remove existing entries from a list, or to shift date/time values (see Image::ExifTool:: and note 6 below for more details).

comment=wow), or delete the tag if no VALUE is given (eg. Write a new value for the specified tag (eg. Exiftool Application Documentation exiftool Application DocumentationĮxiftool - Read and write meta information in files SYNOPSIS ReadingĮxiftool FILE.

Read m4d using exiftool