Batch Image Processing

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ImBatch is a free multithreaded image processing tool for your Windows PC. With the help of ImBatch, users can perform a variety of complex image editing tasks; applying those changes to hundreds of images at once. Whether you’re looking to crop, resize, rotate, add/remove tags or convert image format, ImBatch provides users with dozens of editing tools.
https://www.highmotionsoftware.com/products/imbatch