What I finally did is, I switched to the Dynamic Image Panel as suggested by drodange.
It has three little drawbacks for me:
- It’s not able to scale the images proportionally using just one value. So you have to play a little around (although this is not a big issue).
- It does not have a pager like the Table Panel. This might be very useful especially if you want to look at a larger number of images
- It seems the Panel does not have any hide/collapse function
For those interested how to make Base64 encoded images visible from a database, go here:
jangaraj’s solution might work, but it would mean that hardcoding it via html/css would probably have side effects on other dashboards.