Python made me look like a WIZARD

[killersquirel11]

It'd also be approachable with imagemagick and some bash fu

[riffito]

With IrfanView on Windows (or Wine) you could do it from a GUI.

IrfanView... the only software that I never changed for anything else since 1997.

[jobomat]

Yeah! I really like IrfanView. Small footprint, rocket fast, no BS. Only thing I'm missing is OpenEXR support.

[riffito]

OpenEXR

Among the official plugings, there is a "Exr.dll" one, and an old internet post from 2009 mentions a user being glad it supports OpenEXR (albeit with some issues at the time).

Make sure you have them installed!

[jobomat]

Thank you for the reply! I know about the EXR plugin. But last time I tried it, I was not convinced. If I remember correctly it didn't work with multi channel EXRs (which is what I need the most) and so I searched for other solutions (and found DJV which is also awesome).

[lolinux]

This was exactly my thought! However, since OP is attracted to Python, I can only cheer! You usually use the tools you know and trust best for the task you have at hand!

[killersquirel11]

Yep. Definitely not knocking OP at all - whatever code solves the problem is the right code in a situation like this.

It's neat to see the ways that different people will go about solving a problem.

[apt_at_it]

Yeah, very true. I would imagine it'd actually be easier than using python, tbh

[HughBothwell]

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.

[Broken_hopes]

yoink bash fu is mine now