Bug 23963 - Visible reduction in image quality
Summary: Visible reduction in image quality
Status: CLOSED FIXED
Alias: None
Product: Koha
Classification: Unclassified
Component: Tools (show other bugs)
Version: master
Hardware: All All
: P5 - low major (vote)
Assignee: Martin Renvoize
QA Contact: Martin Renvoize
URL:
Keywords:
Depends on: 21987
Blocks: 22988
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Reported: 2019-11-04 13:24 UTC by Martin Renvoize
Modified: 2021-06-14 21:28 UTC (History)
9 users (show)

See Also:
Change sponsored?: ---
Patch complexity: ---
Documentation contact:
Documentation submission:
Text to go in the release notes:
Version(s) released in:
19.11.00,19.05.05


Attachments
Image display issues (847.74 KB, image/png)
2020-01-30 17:46 UTC, Todd Goatley
Details

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Description Martin Renvoize 2019-11-04 13:24:41 UTC
+++ 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?
Comment 1 Martin Renvoize 2019-11-04 13:32:26 UTC
Revert pushed to master for 19.11
Comment 2 Fridolin Somers 2019-11-15 10:14:27 UTC
Pushed to 19.05.x for 19.05.05
Comment 3 Todd Goatley 2020-01-30 17:46:20 UTC
Created attachment 98179 [details]
Image display issues

Martin and Fridolin, I've recently been contacted by a Koha site on 19.05.06 reporting they're still having issues with images. I have 3 images but could only attached 1. This Koha site reports:

The top example is from before the upgrade. - clear and crisp
The bottom 2 are from after the upgrade - blurred

Images that come in automatically from online are clean/clear, but many of the images I add myself. There was no change in the quality of the images, but it changed with the upgrade.

Thanks! Curious as to what is happening with this...
Comment 4 Todd Goatley 2020-01-30 17:47:44 UTC
Comment on attachment 98179 [details]
Image display issues

The individual reporting this can be reached at generalslibrary@ibethel.org
Comment 5 Jonathan Druart 2020-02-03 12:57:49 UTC
(In reply to Todd Goatley from comment #3)
> Created attachment 98179 [details]
> Image display issues
> 
> Martin and Fridolin, I've recently been contacted by a Koha site on 19.05.06
> reporting they're still having issues with images. I have 3 images but could
> only attached 1. This Koha site reports:
> 
> The top example is from before the upgrade. - clear and crisp
> The bottom 2 are from after the upgrade - blurred
> 
> Images that come in automatically from online are clean/clear, but many of
> the images I add myself. There was no change in the quality of the images,
> but it changed with the upgrade.
> 
> Thanks! Curious as to what is happening with this...

It has been reverted as it caused regressions, see bug 22988.