I have tried image sizes at 216x216, 450 x 450, and 900 x 900 px. as test cases.  They all look the same on the folder.  They are being downsized, but I can't seem to see what the resolution is of the folder preview image itself.  When the image is opened in an info box, it is perfectly clear at the...

They are.  Yes.  It is only on the home page that they look blurry.  All renditions look clear.

We have just created a new library of assets in AEM 6.0.  I have uploaded a set of images to act as folder images, but while the images are crisp and clear individually, when they are used as a folder preview, they are blurry.  Any thoughts as to why?  Adjusting the resolution of the image does not ...