I find the file type icons on thumbnails rather tiny. The ones showing with Preferences > File Display Modes > Thumbnails > Overlay thumbnail with file type icon.
And the bigger the thumbnail, the tinier the icon in comparison and the more difficult to differentiate different types.
Is there any way to adjust/increase their size?
The size of those icons is a system-wide thing. They should be the same size as the icons you see in File Explorer, in the corner of windows, and so on.
Easiest way to increase it is to increase the system DPI, but that affects a lot of other things as well, of course.
They are a lot bigger in File Explorer (and in other alternative explorers). I made sure to check that beforehand. 
In Windows, the icons also scale along. Whereas in Opus it's always 15x15 (or its DPI equivalent), in File Explorer it's like 20x20+.
That seems wrong. Can you post a screenshot?
Are you comparing what you see in File Explorer's Details mode (or folder tree) with what you see in Opus, or something else?
Thumbnails view (with and without a Folder Tree next to it, that doesn't make a difference).
Opus on the left, Windows File Explorer on the right (goes for other application and file type icons also):
I mean the icons in Explorer's details view. Those are the size of icons we draw as thumbnail overlays, and which you should be used to seeing next to files in most modes/programs.
Ah, I see. But those of course are extremely tiny in comparison. Windows also has several zoom steps beyond that with bigger file type icons, and the icons used are even much bigger also (the ones shown under Properties).
Was there ever any solution to this?
It would be great if the file type icon size on the thumbnails in the thumbnails view could be adjusted!
Also if opus can have options for 24px icons instead of 16px for details/power mode.
Opus shouldn't be hamstrung by the limitations of windows, that's why Opus exists in the first place, to break barriers. Microsoft is years behind, decades have passed and high DPI monitors are the standard these days yet icons are stuck at 16px like Windows 95, absurd.
Icons scale with DPI; on a 200% system the small icons are 32x32.
The video shows some thumbnails in thumbnail column being converted to file type icons (or file type sized icons ?) anyway still needs a bit of attention imo.
That is by design.
Hmmm - I cannot find the setting
Feature Request - please put in this setting (or similar, seems a bit lengthy)
Shrinking a thumbnail down to small icons sizes is going to have bad results, and having a thumbnail column so small that you can't see the thumbnails in it doesn't make sense in the first place.
Throwing this into a thread that's already talking about thumbnails and (different) file type icons is also going to make things really hard to follow. Let's stick to what the thread is about, please.
Regarding the actual topic of this thread (file type icon sizes):
My use case is that I use a software similar to Photoshop, and I have many folders with both regular image files, as well as files from that software, and both files of course show an image preview.
So, for me, it would be great if the file type icon size would be bigger, so that I can distinguish the file type immediately visually. Otherwise, what happens, is that I click the non-image file and then the software boots up instead of just the image viewer opening.
I wonder what the intended workflow in DOpus is for this type of problem.
I guess you could group the files by file type, but that's not ideal.
You can use a quick filter to display only the files that interest you.
Another method is to create a label with a file icon that you want displayed instead of the thumbnail
then in Label Assignments create a global wildcard filter for the filetype you want that icon to be displayed for.
(in the label defintion the label can also be pinned to top)
now in thumbnails view your folder should look something like this
Thanks to both of you!
The quick filter is sure a workaround, but also more involved.
If possible, I'd like to see the file type difference at a glance without additional steps.
@galaxyhub
The label assignment thing looks interesting, but when I tried it, the file icon would only change the file type icon (while the icon size still remains small), and the status icon wouldn't show up at all (for example, when I set something to pinned)
In this example, I set the blue label with a custom file icon, and applied that label to the right image. As you can see, the file type icon changes, but the size is the same. When I change from thumbnail to icon mode, the custom icon shows though.
Ultimately, this isn't really a solution either, since I do want to keep the regular thumbnail preview so I know what the contents of the file are, but would just like the file type icon indicator to be bigger.
Yes, agree filetype icon overlay for thumbnails needs to bigger (or adjustable would be even better).
I resorted to the above solution because they are especially small on a 32" 4K screen at 100% scaling.
This was already changed in the current beta.
