Hi All-
Happy to advertise a Quick Look Preview Extension for macOS 15+. Once built and installed (to /Applications), you’ll be able to click on any NIfTI (.nii or .nii.gz) file and press to see a quick preview of the file with relevant information.
Install instructions will be kept up to date on GitHub, but you can (currently) build and install it with the following commands. This will even move a small .app to your /Applications folder and launch it once to enable the plug-in. After that you can ignore the application and just enjoy the functionality in the finder.
git clone https://github.com/pmolfese/NIfTIViewQL
cd NIfTIViewQL
make all
make install
#Close the app (forever?) and Finder Quick Look (space) will work
You will need Xcode on your machine and if you previously installed just the command line tools, you might need to redirect from those to the ones included in Xcode:
sudo xcode-select -s /Applications/Xcode.app/Contents/Developer
This is inspired by the awesome DTI-TK extension by Gary Zhang that used to work on previous versions of macOS, which unfortunately stopped working in macOS 15.