Abstract
The TIFF uncompressed file format is a widely accepted standard for storing master images of digitisation projects. As in the Koninklijke Bibliotheek, The National Library of the Netherlands (KB) the scale of these projects is rising rapidly, the need for an alternative, compressed file format is felt. This paper contains a summary of a research project in which four alternative file formats - JPEG 2000 Part 1 lossless and lossy, PNG, JPEG and TIFF LZW - have been described and tested. Four consequences of a choice for either of the formats have been described: consequences for storage, image quality, long term durability and functionality. In the final recommendations these consequences were weighed against three reasons the KB distinguishes for wanting to store master images:1. Substitution (JPEG 2000 Part 1 lossless or PNG)2. Redigitalisation is no option (Visual lossless JPEG 2000 Part 1 lossy or JPEG)3. Master file is the basis for access (JPEG and JPEG 2000 lossy with higher degrees of compression)
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