JP2 Samples for review
In our current workflow, we convert TIFs from our scanner(s) into 100% lossless JP2 using LuraTech's SDK. We're evaluating lower quality JP2, and your comments are appreciated for the following images. This sample was taken from a volume of Curtis' Botanical Magazine. There are 211 images in the volume.
Total file size for all uncompressed TIFFs: 4.39GB
Total file size for 100% JP2: 2.28GB
Total file size for 90% JP2: 660MB
Total file size for 80% JP2: 499MB
Total file size for 50% JP2: 160MB
Total file size for 30% JP2: 58.5MB
Illustration - TIFF 21.6MB
100% quality JP2
Size: 12.6MB
90%
Size: 2.8MB
80%
Size: 2.0MB
50%
Size: 527KB
30%
Size: 184KB
Text - TIFF 21.0MB
100% quality JP2
Size: 10.7MB
90%
Size: 2.8MB
80%
Size: 2.0MB
50%
Size: 565KB
30%
Size: 208KB
posted by Chris Freeland @ 3:15 PM
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2 Comments:
I like the 100% especially on the text pages. much easier to read when printed out the smaller sizes blur the type so certain letters are unreadable.
With respect to the illustrations, there is, in many situations, quite a bit of either compression or physical artifact (in general, among the collection) which can't probably be better alleviated/ameliorated without having to load from the tiff files I suspect. The 100% files are therefore the best alternative and there really are notable declines in quality moving down in the % examples you linked, particularly at the higher magnifcations. These are significant differences in my opinion and I hope you are able to persist with the higher quality version.
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