Difference between revisions of "Raster images"

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[[Main Page]] > [[Documentation]] > [[Media type preservation plans]] > Raster images
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[[Main Page]] > [[Documentation]] > [[Format policies]] > Raster images
  
  
==[[Significant properties of raster images]]==
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==[[Significant characteristics of raster images]]==
  
 
==Preservation Format==
 
==Preservation Format==
Uncompressed TIF
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Uncompressed TIFF for all but JPEG2000 and PNG, which will be retained in their original formats.
  
 
==Access Format==
 
==Access Format==
PNG
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JPEG
  
 
==Normalization tool==
 
==Normalization tool==
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==Comments==
 
==Comments==
If images are ingested in PNG or JPEG2000 format they will be left in those formats rather than normalized to TIF.
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*Florida Digital Archive has "high confidence level" in ability to preserve uncompressed TIFF files: [http://www.fcla.edu/digitalArchive/formatInfo.htm FDA Recommended Data File Formats].
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*"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."  [http://hul.harvard.edu/ois/digpres/guidance.html Harvard University Library, File Formats and Guidelines]
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*Library of Congress considers TIFF 6.0 to be "one of the preferred formats for bitmapped images." [http://www.digitalpreservation.gov/formats/fdd/fdd000022.shtml Library of Congress Sustainability of Digital Formats: TIFF, Revision 6.0]
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*Library and Archives Canada considers TIFF to be a recommended format for still images: [http://www.collectionscanada.gc.ca/government/products-services/007002-3017-e.html Guidelines for Computer File Types, Interchange Formats and Information Standards]
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*If images are ingested in PNG or lossless JPEG 2000 format they will be left in those formats rather than normalized to TIFF.
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==More information==
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*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).
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*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/.
  
 
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Latest revision as of 16:16, 13 February 2013

Main Page > Documentation > Format policies > Raster images


Significant characteristics of raster images[edit]

Preservation Format[edit]

Uncompressed TIFF for all but JPEG2000 and PNG, which will be retained in their original formats.

Access Format[edit]

JPEG

Normalization tool[edit]

ImageMagick

Comments[edit]

More information[edit]