The requests usually entail PDF forgery analysis or intellectual property related investigations. In virtually all cases, I have found that the PDF metadata contained in metadata streams and the document information dictionary have been instrumental. I will provide a brief overview of these metadata sources and then provide an example of how they can be useful during PDF forensic analysis. PDF is an electronic file format created by Adobe Systems in the early s.
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In his spare time he enjoys tinkering with gadgets and code. So we are doing a quick article detailing what is XMP metadata and why it is useful. What is XMP metadata? With images this can be incredibly useful as it means you can attach data to the image and it will not be lost as the image is transferred and used.
This, of course, is assuming you have embedded the data, storing the metadata as an external object can lead to the data being lost or ignored. Admittedly embedding the metadata will increase the filesize of the image, this is only a small increase and ensures the image and the metadata are kept together. The other thing you should know about XMP is that it is extensible allowing you to add custom parameters to suit your needs.
How can I use it? With some creativity you can use metadata for a variety of different tasks. Below I have covered 2 common activities you may wish to perform and how they can be done using JDeli. Writing Licence details to XMP metadata.
This first, most obvious and frequently used use of metadata is to assert the rights of the creator. Adding metadata to an image can allow you to add the creators details along with any license the image is under. In this way even if the image is transferred to others these details travel with it ensuring that, if needed, the images creator and licence can easily be checked. Adding XMP metadata to a Tiff file can be done with the following code.
This is something many image processing and storing softwares already do but is incredibly useful. Metadata can be used to help sort images into different albums and folders. Many cameras will add metadata to images when they are taken. This can include date, time and location to name just a few. This data can then be used with some software to sort the images based on this data.
Getting the meta data to be used in sorting can be done with the following code. On the blog our team post about anything interesting they learn about.
How to: Read Image Metadata
XMP provides a standard format for the creation, processing, and interchange of metadata for a wide variety of applications. The XMP specification is available from Adobe. What is XMP? XMP is a standard for processing and storing standardized and proprietary metadata in digital assets. XMP is designed to be the common standard that allows multiple applications to work effectively with metadata.
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It also helps to have a general familiarity with imaging metadata, especially XMP. Introduction Microsoft has created a new XMP schema for tagging people within a digital image. This schema enables applications to store the names and locations of individuals who are in the image as metadata within the image. In addition to the new schema, the new photo property System. WIC utilizes these new features by enabling applications to easily read and write people tagging metadata to digital photos. These interfaces enable applications to use the metadata query language to write metadata to the individual frames of an image.
Getting Metadata from Digital Photographs Using C#
C# XMP Toolkit