Ever since Ubuntu 10.04 “Lucid Lynx”, there has been a white border around thumbnails of pictures and videos when you look in a folder. But you can actually change that to whatever you want, and here I’ll show you how to turn the distracting white border into a nice drop-shadow, free of any other border.
Open a terminal and enter the following:
That will download the image file to your home folder; the following command will then move it to the folder where Nautilus (your file manager) keeps its image files, renaming it appropriately as it does so:
sudo mv thumbnailframe.png /usr/share/pixmaps/nautilus/thumbnail_frame.png
Now, you need to totally restart Nautilus:
sudo nautilus -q
If you decide that you want to restore the original white border, you can basically run the same sequence again, but this time downloading the familiar thumbnail background:
sudo mv thumbnailframey.png /usr/share/pixmaps/nautilus/thumbnail_frame.png
Obviously, you can play around with your own thumbnail borders using the dimensions of the drop-shadow image (quite simply a square).
Also, if you would prefer to copy rather than move the image files to the Nautilus folder, thereby always having copies in your home folder, replace mv (move) in the command with cp (copy).
Just in case the images are no longer available, you can find them below. Simply right-click them and (1) in the case of the larger drop-shadow image, choose to save the target of the image (or open it in a new tab and save the image that appears), and (2) in the small default image below it, choose to save the image. If you saved them to your home folder, the second command in each sequence will still apply; if you saved them to another folder, like ~/Downloads, open a terminal in that folder and the commands will work fine.
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