Types of File Comments

LEAD supports reading and writing of image file comments.

For more information about file comments, refer to RasterCodecs.ReadComment and RasterCodecs.WriteComment.

Image Metadata, Comments, and Tags

Some file formats can contain comments, and some cannot, and each file format has its own set of comment types.

Exif files contain either uncompressed TIFF images or compressed JPEG images. These files can contain many comment fields of various types called metadata.

Metadata

Metadata refers to extra information stored with the image file that is not necessary for decoding the image. Metadata can contain comments describing the contents in the file format.

Comments

A comment in the context of TIFF file formats, refer to metadata that can be read from the file or saved to it. For example, a TIFF comment to describe the file is saved using the RasterCommentMetadataType.Description tag.

Tags

A tag identifies data that describes content in a file format, such as TIFF. Tags is a collection contained in the file format (e.g., tags to read\write TIFF metadata ).

Resources

Below is a table providing reference material related to Exif (TIFF and JPEG) metadata:

Related Topics

DICOM File Comments
Exif File Comments
Exif File Extensions
GIF File Comments
IPTC Comments
JPEG 2000 File Comments
JPEG and LEAD File Comments
PNG File Comments
TIFF File Comments
Notes on Exif Data
Non-Image Data
Working with Markers
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LEADTOOLS Imaging, Medical, and Document
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© 1991-2021 LEAD Technologies, Inc. All Rights Reserved.