mjw
(Here I am with a brain the size of a planet and they ask me to pick up a piece of paper. Call that job satisfaction? I don't.)
3
I think the issue is that Qobuz show a cover using the correct dimensions, but the canvas is square. If the canvas is white, Roon will display these bands.
In my library, there are some releases with a different aspect ratio, and Roon displays them correctly.
I’m not sure this is recent. I always just thought it was something roon was going to do nothing about. There are change requests to categorize “best” album art as a more square aspect ratio rather than a higher resolution but there has never been any traction.
With the “light” color scheme and non-Classical, narrow white bands are usually not noticeable. Annoyingly roon uses a grey rather than a white background for Classical so it doesn’t matter what color scheme you use, dark or light, narrow white bands are noticeable. Mostly I find that the album art with wide white bands are box sets where the aspect ratio of the box-set packaging is not square. I just crop and replace using microsoft Paint.net. After many years I now have thousands of these jpgs and since roon removed scroll bars from various screens it is borderline impossible to replace these jpg’s.
mjw
(Here I am with a brain the size of a planet and they ask me to pick up a piece of paper. Call that job satisfaction? I don't.)
5
Most images in my library that aren’t square are from Digipak releases where the image extends the full width of the packaging. However, I have some that are portrait for book sets etc.
But my point is really confirming what @Marin_Weigel said. That is, Roon correctly displays what it receives. If there is an offending cover, I either source a new image, scan the media, or use a lower resolution image that is a more accurate reflection of the release.