Two problems with cover images: rotation and scaling
Hello, I have two problems with local cover images in our KOHA instance (18.05.14.000). They concern rotation and scaling of the images. 1. When uploading a local cover image which is in portrait mode (i.e. width is smaller than height), KOHA will display this image in the catalogue rotated 90°, i.e. in landscape mode... so you have to twist your neck to read it. Very inconvenient! Is there a way to avoid this? I scanned the system preferences but I could not find anything whose name suggests it has anything to do with that. When I upload images in landscape mode, they remain upright, so everything is fine. Images uploaded are jpg, size seems irrelevant. 1. The upladed images get scaled down, resolution is lost significantly. I am aware that KOHA displays images as thumbnails and when you click on them supposedly in full size. But even the full size view has lost resolution. When a cover image contains a photo of the table of contents from a book, this cannot be read anymore when viewed in KOHA... but the picture before upload is very clear. Is there a way to control the downsizing/scaling, that KOHA obviously applies here? Thanks in avdance, André Hartmann KOHA admin of the libraries of the Berlin astronomical observatories
Hello André, 1. It's hardcoded, you cannot configure that. You should open a bug report. 2. It's a bug that has been fixed in more versions, see bug 23963 (which actually reverts 21987) Regards, Jonathan https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=23963 https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=21987 Le jeu. 11 févr. 2021 à 07:41, André Hartmann <andrehartmann@hotmail.com> a écrit :
Hello,
I have two problems with local cover images in our KOHA instance (18.05.14.000). They concern rotation and scaling of the images.
1. When uploading a local cover image which is in portrait mode (i.e. width is smaller than height), KOHA will display this image in the catalogue rotated 90°, i.e. in landscape mode... so you have to twist your neck to read it. Very inconvenient! Is there a way to avoid this? I scanned the system preferences but I could not find anything whose name suggests it has anything to do with that. When I upload images in landscape mode, they remain upright, so everything is fine. Images uploaded are jpg, size seems irrelevant.
1. The upladed images get scaled down, resolution is lost significantly. I am aware that KOHA displays images as thumbnails and when you click on them supposedly in full size. But even the full size view has lost resolution. When a cover image contains a photo of the table of contents from a book, this cannot be read anymore when viewed in KOHA... but the picture before upload is very clear. Is there a way to control the downsizing/scaling, that KOHA obviously applies here?
Thanks in avdance,
André Hartmann KOHA admin of the libraries of the Berlin astronomical observatories _______________________________________________
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1. When uploading a local cover image which is in portrait mode (i.e. width is smaller than height), KOHA will display this image in the catalogue rotated 90°, i.e. in landscape mode
In my experience when this happens in other (non-Koha) situations, the explanation is in the photo's EXIF data: https://www.howtogeek.com/254830/why-your-photos-dont-always-appear-correctl... Koha isn't designed to read EXIF orientation data. If the photo was created in landscape mode and it's the data which tells your photo viewer that it should be displayed in portrait mode, Koha doesn't know it. I don't know if this has any relevance to your situation but I thought it might help. I've never seen Koha incorrectly rotate a cover image. -- Owen -- Web Developer Athens County Public Libraries (740) 737-6006 https://www.myacpl.org
participants (3)
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André Hartmann -
Jonathan Druart -
Owen Leonard