A tool for half-frame filmA small Windows app for half-frame film. It splits each scan into its two photos, keeps track of your rolls, and exports full-resolution files and contact sheets.
I started shooting half frame on a Pentax 17 and got hooked. Each frame on the roll holds two vertical photos, so every scan from the lab comes back as a pair.
I wanted a clean, easy way to crop those scans, or leave them whole when a shot works better as one picture. I also wanted somewhere to keep track of my rolls, and a way to export hi-res contact sheets.
So I built Splitroll. It's a mix of two things I like doing: building tools and shooting film.
Drop in a folder of scans and it becomes a roll. Splitroll finds the gap between the two halves on each scan. You check it, adjust anything that's off, and export.
Drag a folder of scans onto the window. Splitroll looks for the gap between the two halves on every scan and sets the cut for you. The contact sheet shows the whole roll, so you can check it at a glance and fix several frames at once.
Drag the cut line, adjust the border with the tabs on either side, and rotate the scan or either half. If a shot runs across both frames, mark it Full and it exports as one image.
TIFF and PNG keep the 16-bit depth and colour profile. JPEG exports at quality 100 with no chroma subsampling. Files are named after the roll (ROLL_01L, ROLL_01R) or after the original scan. You can also export the whole roll as one contact sheet image.
Windows 10 or 11. No account and no admin rights needed. Everything stays on your computer.
splitroll-1.3.0-setup.exe and run it. It installs just for your user, so there's no admin prompt.Each release on GitHub lists a SHA-256 checksum if you want to verify the download. Coming from the old Mac version (halfframe 1.1)? Use ⋯ › Import v1.1 library.
Ctrl+Z.Photos in the screenshots were shot on a Pentax 17.