I'm looking for a way to add a 3 pixel black border to every file in a folder. File type is .jpg.
My OS's are Ubuntu 14.04, Ubuntu 15.10, and Windows 7.
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It's a command line utility which is very suitable for batch processing of many files without user interaction.
Here is my stored procedure for border insertion - Infran Procedure to add a border
gnuThumbnailer supports Windows and Linux. It is primarily for creating thumbnails of images but has an option for adding borders to images. This option would probably only work if your images are the same size.