this is a followup report from bug #330868 there seems to be a hardcoded limit of 3mb which cuts off image previews in file properties, preview tab. for example, if the image is 3106009 bytes, preview is shown, if it's 3230231 bytes - not shown. images are from the same camera and have the same settings. this has been showing with a fairly large amount of images for testcase, see http://bugsfiles.kde.org/attachment.cgi?id=85196 (don't want to attach it twice) this is a companion bug to bug #331240 which is about previews on folder icons Reproducible: Always
I can confirm this bug. I use openSuSE 13.1 with KDE 4.11.5. In Dolphin previews of, for example, images with file properties higher than 3 MB work fine. But when I work with Thunderbird and want to attach an image with a file property higher than 3 MB I don't get a preview. I think the default limit on local file preview size of 3 MB like it was in older KDE versions is in this case still active.
That issue is in openSUSE since 12.3 To workaround you must specify MaximumSize manually in .kde4/share/config/kdeglobals
The Preview tab is no more; use the Information Panel now, which has no such issues.