[Koha] Images quality reduction

[Russel G. P. Shihepo]

Dear Community

Whenever I upload a local cover image, the quality of the image gets
reduced by Koha. This happens when you try to preview a record cover image
or cover image in a large view by clicking on it either on OPAC or the
Staff interface.

For example if the original image is 300dpi, the quality is reduced and
renders content too blurry to see any details in the photo.

Is there a possible way to change parameters in order to increase the image
quality for both OPAC and Staff interfaces ? Make all the cover pictures
300 dpi for instance?

I tried with no avail with some CSS tags:
.cover-image img
.chocolat-image-wrapper .chocolat-img

Regards,
Russel Shihepo