Thread:JoePlay/@comment-4347751-20121009190049/@comment-171752-20121012185315

It really comes down to trial and error until you like how it looks. I can't tell you exactly what blur radius and opacity setting I used, because I don't use GIMP, and the drop shadow settings are different with Photoshop.

For this use, I would suggest using at least 80% opacity, maybe even 100%. For the blur radius, probably around 10 or so. But again, the best thing to do is just tinker with the settings to get a feel for how those settings change the appearance.

Also, it appears that instead of size, GIMP's settings are Offset X and Offset Y. I think setting both of those to 0 should result in the shadow extending equally from the edge of the image, and not "dropping" below it.