The tags below are found in JPEG 2000 images and the C2PA CAI JUMBF metadata
in various file types (see below). Note that ExifTool currently writes only
EXIF, IPTC and XMP tags in Jpeg2000 images, and EXIF and XMP in JXL images.
ExifTool will read/write Brotli-compressed EXIF and XMP in JXL images, but
the API Compress option must be set to create new EXIF and XMP in compressed
format.
C2PA (Coalition for Content Provenance and Authenticity) CAI (Content
Authenticity Initiative) JUMBF (JPEG Universal Metadata Box Format) metdata
is currently extracted from JPEG, PNG, TIFF-based (eg. TIFF, DNG),
QuickTime-based (eg. MP4, MOV, HEIF, AVIF), RIFF-based (eg. WAV, AVI, WebP),
PDF, SVG and GIF files, and ID3v2 metadata. The suggested ExifTool
command-line arguments for reading C2PA metadata are -jumbf:all -G3 -b -j
-u -struct. This metadata may be deleted from writable JPEG, PNG, WebP,
TIFF-based, and QuickTime-based files by deleting the JUMBF group with
-jumbf:all=. The C2PA JUMBF metadata may be extracted as a block via the
JUMBF tag. See https://c2pa.org/specifications/ for the C2PA
specification.
--> JSON Tags (by default, data in this tag is parsed using the ExifTool JSON module to to
allow individual tags to be accessed when reading, but it may also be
extracted as a block via the "JSONData" tag or by setting the API
BlockExtract option)
(by default, the XML data in this tag is parsed using the ExifTool XMP module
to to allow individual tags to be accessed when reading, but it may also be
extracted as a block via the "XML" tag, which is also how this tag is
written and copied. It may also be extracted as a block by setting the API
BlockExtract option. This is a List-type tag because multiple XML blocks
may exist) --> XMP XML Tags (used for XMP in JPEG XL files) --> XMP Tags
The table below contains tags in the color specification (colr) box. This
box may be rewritten by writing either ICC_Profile, ColorSpace or
ColorSpecData. When writing, any existing colr boxes are replaced with the
newly created colr box.
NOTE: Care must be taken when writing this color specification because
writing a specification that is incompatible with the image data may make
the image undisplayable.
Index1
Tag Name
Writable
Values / Notes
0
ColorSpecMethod
int8s!
(default for writing is 2 when writing ICC_Profile, 1 when writing
ColorSpace, or 4 when writing ColorSpecData) 1 = Enumerated
2 = Restricted ICC
3 = Any ICC
4 = Vendor Color
1
ColorSpecPrecedence
int8s!
(default for writing is 0)
2
ColorSpecApproximation
int8s!
(default for writing is 0) 0 = Not Specified
1 = Accurate
2 = Exceptional Quality
3 = Reasonable Quality
4 = Poor Quality
