[Koha-bugs] [Bug 23963] New: Visible reduction in image quality

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=23963

            Bug ID: 23963
           Summary: Visible reduction in image quality
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: major
          Priority: P5 - low
         Component: Tools
          Assignee: koha-bugs at lists.koha-community.org
          Reporter: martin.renvoize at ptfs-europe.com
        QA Contact: testopia at bugs.koha-community.org
                CC: bibliwho at gmail.com,
                    jonathan.druart at bugs.koha-community.org,
                    katrin.fischer at bsz-bw.de, magnus at libriotech.no,
                    mtj at kohaaloha.com, testopia at bugs.koha-community.org,
                    wizzyrea at gmail.com
        Depends on: 21987, 22988

+++ This bug was initially created as a clone of Bug #22988 +++

RM NOTE: This bug is a placeholder to note that we are reverting bug 21987
whilst we work on the main issue for a longer term resolution to bug 22988 in
that bug.

I have a library that is noticing a visible reduction in image and thumbnail
quality after upgrading from 18.11.03 to 18.11.05. This could be a regression
from bug 21987. 

They have a lot of scanned black and white covers. The largest text in the
thumbnails used to be readable, but after the upgrade, it is not. Their
scanning process has not changed, so the original image that they upload should
be of the same quality as before. 

Old, good image:
http://bibliotek.dis-danmark.dk:8080/cgi-bin/koha/catalogue/image.pl?imagenumber=4332
http://bibliotek.dis-danmark.dk:8080/cgi-bin/koha/catalogue/image.pl?imagenumber=4332&thumbnail=1

New, not so good, image:
http://bibliotek.dis-danmark.dk:8080/cgi-bin/koha/catalogue/image.pl?imagenumber=4463
http://bibliotek.dis-danmark.dk:8080/cgi-bin/koha/catalogue/image.pl?imagenumber=4463&thumbnail=1

Did we reduce the quality a bit too much?


Referenced Bugs:

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=21987
[Bug 21987] Local cover 'thumbnail' size is bigger than 'imagefile' size in
biblioimages table
https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=22988
[Bug 22988] Visible reduction in image quality
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