Camera Raw Images / Adobe DNG
- Former user (Deleted)
Introduction
Harvard Library collections include digitized images preserved in the Library’s preservation and access repository - the Digital Repository Service (DRS). The Library is considering adding the Digital Negative (DNG) format and/or other camera RAW image formats to the list of image formats accepted by the DRS, to enable functions not supported by the other image formats. As a first step towards accepting these formats in the DRS, the Library hired Jack Holm of Tarkus Imagining to assist with the analysis. Specifically the project tasks were to:
- prepare detailed descriptions of different versions of the TIFF format (because these formats are based on the TIFF format)
- analyze the preservation suitability of these TIFF versions
- describe and recommend encoding options intended to maximize the likelihood that Harvard will be able to render the archived images in the future as they desire
Mr. Holm was a primary contributor in the development of TIFF/EP and a pioneer in digital camera raw formats and processing. He also contributed to the development of JPEG 2000 (ISO/IEC 15444-x), the ICC profile format specification (ISO 15076-1), and the Image State Architecture standard (ISO 22028-1). His past consulting clients in the field of digital archiving include Corbis and NASA.
Format Analysis
The original deliverable combined everything into a single document. They are available here as separate documents for convenience.
| Document | Description | Authors |
|---|---|---|
| TIFF categories | This document categorizes the TIFF image file format (excluding TIFF/IT, BigTIFF and GeoTIFF) for the purpose of grouping different functional capabilities and the associated reader support. | Jack Holm |
| TIFF format descriptions | This document contains brief profiles of each of the TIFF formats as categorized in the document above.. Along with descriptive information about the format, it includes a summary of risks and potential strategies for mitigating the risks. | Jack Holm |
| Recommended encoding options | This document describes recommended uses of each of the TIFF formats, including a specific focus on Adobe DNG. | Jack Holm |
| TIFF Preservation Suitability Matrix | This document is intended to replace the two “Common TIFF” rows in the | Jack Holm |
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