Is that 1524 dpi for Batch A a misprint? If not, that's very likely to be
your problem -- I doubt that's what the vendor really scanned at.
If you change the dpi values and try to reload, my guess is you'll get very
On Wed, May 25, 2016 at 2:40 PM, Bernadette Houghton <
[log in to unmask]> wrote:
> 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
> 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?
> Bernadette Houghton
> Digitisation and Preservation Librarian
> [Title: Deakin University logo]
> Deakin University
> Locked Bag 20000, Geelong, VIC 3220
> +61 3 52278230
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