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the photos are quite blurred when viewing the Media-Gallery on a bigger screen-size like e.g.: 23 inch or 24 inch screen monitor.
I guess this is because the images are originally in smaller size and then zoomed up (increased based on the screen-size).
Would it be possible to have a certain limit on how big the images are zoomed-up (width x height), but have more images displayed in the grid (more than 12) in order to fill the screen ?
It is impossible to know screen size within PHP and adjust images returned. This is really something you'll usually just have to deal with in pretty much any gallery application.
The problem as described is most prevalent on large screens with a fluid width. I'll be the first to admit the current gallery design works better on a fixed width screen.
But, there is actually a very simple CSS solution.
Under Settings:
Change the default items per row to a ridiculous number, e.g. 999
Under Responsive Column and Miscellaenous, add a fixed width, e.g.
width: 300px;
The end result is something like this. I created this screenshot a while ago:
So the effect of the above simple changes is there is no longer a fixed number of items per row, and the items themselves are of a fixed width. This is more how it worked on very early versions of the Gallery. However, the above approach still allows the Responsive Design to kick in at the necessary points:
It won't affect the number of items shown per page. It's actually just a bit of a hack to override some CSS.
Actually 999 can just be any number higher than the number of items you show per page, but it affects nothing other than making the end effect possible. (If that makes sense).
I was thinking along the lines of having the images as a fixed width (e.g.: width of 300px) and the grid being "responsive".
So that the number of images on the page adjusts itself towards the screen-size.