thumbnail not working

I tried to put the thumbnail icons like a lot of screenshots do, but I don’t get a thumbnail on my desktop. I read on one of the threads that I need an image magick, which I do have installed on my computer.

What version of image magick do it need? and what else is necessary to create thumbnail?

any recent version or an older one should do, the only command you need is ‘convert’ with a few arguments, check it out yourself. Did you add thumnail to your FvwmEvent? Did you add it to a keybinding instead of Iconify? Is the function correct? Do you have dethumbnail?