Raster images
Jump to navigation
Jump to search
Main Page > Documentation > Format policies > Raster images
Significant characteristics of raster images
Preservation Format
Uncompressed TIFF for all but JPEG2000 and PNG, which will be retained in their original formats.
Access Format
JPEG
Normalization tool
ImageMagick
Comments
- Florida Digital Archive has "high confidence level" in ability to preserve uncompressed TIFF files: FDA Recommended Data File Formats.
- "TIFF 6.0 has been commonly used at Harvard for digital master images, and is considered an archival file format suitable for long-term preservation." Harvard University Library, File Formats and Guidelines
- Library of Congress considers TIFF 6.0 to be "one of the preferred formats for bitmapped images." Library of Congress Sustainability of Digital Formats: TIFF, Revision 6.0
- Library and Archives Canada considers TIFF to be a recommended format for still images: Guidelines for Computer File Types, Interchange Formats and Information Standards
- If images are ingested in PNG or lossless JPEG 2000 format they will be left in those formats rather than normalized to TIFF.
More information
- Analysing the Impact of File Formats on Data Integrity. Proceedings of Archiving 2008. Bern, Switzerland. Retrieved from http://old.hki.uni-koeln.de/people/herrmann/forschung/heydegger_archiving2008_40.pdf (via Richard Wright of the BBC).
- Is JPEG 2000 a Preservation Risk? The Signal Digital Preservation Blog, Library of Congress, http://blogs.loc.gov/digitalpreservation/2013/01/is-jpeg-2000-a-preservation-risk/.