A long while back, I decided that if I ever had a problem, and the answer to the problem wasn’t obvious from Google, then I’d write it on my weblog and hope that the next person with the same problem finds my solution instead. So here goes. If the wording sounds a bit funny, it’s because I’m trying to cast the search-word net wide enough to catch anyone who’s looking for similar things.
In Konqueror (the KDE file manager), there is a limit to the file size for the file previews to work, to try to stop your computer getting bogged down if you’ve got lots of large images. I ran into this today when I was trying to look at some of my new photos, since my shiny new toy takes rather large pictures, and only a couple of them were small enough that the preview worked. Searching for ‘kde preview image size limit’ picked up some stuff about the limit being hardcoded into KDE, but that’s waaay out of date, and you can change the limit from the menu nowadays. For KDE 3.0.3 at least (yes, I know how old it is), try Settings->Configure Konqueror->File Manager->Previews->Maximum File Size, and increase the slider.
Fairly obvious, I know, and I fixed the problem a lot quicker than it took to write all that out. But the internet is supposed to be the Source Of All Answers, so I’m just doing my bit.