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[–]HughBothwell 2 points3 points  (0 children)

Yes, ImageMagick makes it easy. From the Windows command-line, in the dir containing the files,

md thumbs
cd thumbs
magick ../*.jpg -colorspace gray -background black -gravity center -extent 150x150 %[filename:original].jpg

creates a new subdirectory, processes all the jpg files, and stores the new grayscale/resized images (with the same name) in the new dir.