We have had some test scans made of a pressed flower album, and are mightily 
puzzled by the difference in quality when we process the resulting JPGs through 
BookReader. There are 2 batches, each taken by different 3rd parties.

For Batch A, the original JPGs are ~3-4MB each, 1524 dpi, 24 bit depth. When 
passed through the BookReader, the resulting JPGs are ~20-25KB, 150 dpi, 24bit 
depth.

For Batch B, the original JPGs are ~700KB-1MB each, 200 dpi, 24 bit depth. When 
passed through the very same BookReader, the resulting JPGs are ~80-85KB, 150 
dpi, 24 bit depth.

For Batch A, the quality when viewing in the BookReader is atrocious. Not 
surprising, I guess, given the resulting files are so small. Batch B comes up 
'OK' in the BookReader.

What I can't figure out is why is it that Batch A comes out most poorly after 
being processed by BookReader, given the original file sizes and resolution are 
so much larger than Batch B. Can anyone shed any light?

When I look up the exif data of the files, Batch A has a compression factor of 
6; while batch B is 1. Could this have anything to do with it?

Thanks.

Bernadette Houghton
Digitisation and Preservation Librarian
Library
[Title: Deakin University logo]
Deakin University
Locked Bag 20000, Geelong, VIC 3220
+61 3 52278230
bernadette.hough...@deakin.edu.au<mailto:bernadette.hough...@deakin.edu.au>
http://orcid.org/0000-0001-5730-8805
www.deakin.edu.au<http://www.deakin.edu.au/>
Deakin University CRICOS Provider Code 00113B


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