KDE konqueror - not showing image previews

One of those "blindingly obvious with hindsight" problems.

Problem: When browsing all our digitized images I noticed that many were not showing up as preview icons. Entire directories of images would have no previews, yet others would have 2 or 3 of 30+; others would have all.

Weird.

Google-Fu wasn't remotely successful. But did lead to the right place.

Konqueror ; Settings ; Configure Konqueror...

Scroll down to "Previews & MetaData"

Underneath the box of protocols to choose from "Select Protocols" is a horizontal slider.

"Maximum File Size". It's not obvious what this means or does from context or name. On my system that was having the issue, this was set to 1Mb. Increased to 5Mb and the problems went away.

Obviously, with the benefit of hindsight, what this actually means is the Maximum File Size to enable a preview to occur. Doh!