|PALMM Guidelines for Digitizing Derived JPEG2000 Images|
|Purpose & Scope|
|JPEG2000 (JP2) is an increasingly well supported standard for still image compression from the JPEG committee. It is recommended for service copies of both printed and visual materials (preferred over JPEG).|
JPEG2000 images can be derived from TIFF masters automatically by DigiTool as an Ingest Task. However, this means that the TIFFs must be loaded into DigiTool as well, which may not be desirable. Libraries can create their own JP2 derivatives using software such as Kakadu, Photoshop, Aware and Jakarta. If so, the following specifications are recommended.
No single method of processing is recommended. However, the following Instructions provide one example using Adobe® Photoshop® CS (Photoshop 8.0).
This should be changed to ‘.jp2’.
* Include Metadata should be checked.
* Include Color Settings should be checked
* JP2 Compatible should be checked and greyed out.
* Quality should be set to the standard (10% to 15%).
* XMP should be unchecked unless data is being saved with the FileInfo
feature of Photoshop
* EXIF should be checked
* Wavelet Filter should be Float
* Tile Size should be set to 1024 x 1024.
* ICC Profile should be included.
It is recommended that this process be automated by creating an Action and running a batch against a folder or collection of folders, or by using an application which employs scripting.
A visual inspection together with a query of the file header should be completed by spot check. Spot check requires inspection of every image in thumbnail view and of no less than 10% of the images in full-image view. A variety of factors effecting on-screen and print legibility should be examined. For additional guidance, we recommend reading Digital Imaging Tutorial: Quality Control.
Keywords: PALMM Digitizing Derived JPEG2000 Archival Museum