Some time ago (around October 2018 I think) someone asked me to help with an X-ray microtomography image of what I think is a rock or concrete sample. They shared it with me via a now-dead Google Drive link. Its name starts with
s10up, it’s 2103 x 2103 x 1585 pixels, and a binarised version of it turns out to be a really good test image for particle analysis.
I’d like to give credit to the originator of this image, and even better get permission to share it or its derivatives. Unfortunately, my scans through email and this forum are drawing a blank. If it’s yours, please get in touch!