Sliding overlays¹
Synchronized pan and zoom¹
Butterfly Viewer is a desktop multi-image viewer with sliding overlays, synchronized pan and zoom, and other handy features to rapidly compare local image files. This can be useful for visually inspecting painting research data such as high-res and raking-light photos, X-rays, and element maps from XRF and RIS.
The Viewer runs as an installable Windows executable or directly on its Python source code. For Macs, sign up to beta test the macOS version.
Most types of PNG, JPEG, and TIFF can be loaded into the Viewer.
Butterfly Registrator can be used to create aligned copies of your images so you can more accurately compare them with synced movement and sliding overlays in the Viewer. The Registrator helps you align (or register) images to a given reference image such that their heights and widths match and the features within those images line up.
¹Small Pear Tree in Blossom by Vincent van Gogh. Credits: Van Gogh Museum, Amsterdam (Vincent van Gogh Foundation)
Auto-arranging side-by-side image windows
Our Butterfly Viewer page documents how to install and use the Viewer, as well how contribute to it as a developer.
Install as Windows executable
Test the macOS app beta by signing up here
Run on Python
Tutorial of main features
Help with common questions
Or see the source markdown file in the docs branch under docs/DEVELOPERS.md.