PNG File Comments

PNG has MMX optimized code for loading and saving files, and it supports comments. Comments can be saved when saving a PNG file, but comments inside existing files cannot be updated. The following comments are supported:

Value

Meaning

RasterCommentMetadataType.Artist

Person who created the image.

RasterCommentMetadataType.Copyright

Copyright notice.

RasterCommentMetadataType.DateTime

Date and time (YYYY:MM:DD HH:MM:SS). The field length is 20, counting the NULL terminator.

RasterCommentMetadataType.Description

Description of the image.

RasterCommentMetadataType.Make

Manufacturer of the equipment used to create the image.

RasterCommentMetadataType.Title

Title of the image.

RasterCommentMetadataType.Software

NOTE: If you are using the Nag version of Leadtools.dll, this comment is fixed and cannot be changed.

Name and version of software package used to create the image.

RasterCommentMetadataType.Disclaimer

String containing the disclaimer of the software used to create the image.

RasterCommentMetadataType.Warning

Warning statement associated with the software that created the image.

RasterCommentMetadataType.Misc

Miscellaneous information.

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

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