make export to generate a zip bundle with the render executable and all test files.variants.zip to your test-machine, unzip it, and run ./render-icons from the extracted directory.results.zip back to your machine.1) gen-raw-files.py generates raw image files (argb¹, rgb¹, png, jpf) with a 2px interleaved RGB-pattern.
=> Pre-computed results are archived in assets/raw-files.zip.
Note: Due to lack of support, jp2 cannot be generated.
2) gen-variants.py converts raw images to .icns and .app bundle files (raw images are read directly from the zip file without unzipping).
Note: You can generate these on the fly or copy the result to the target machine manually.
3) render-icons (10.6+) converts these .icns and .app thumbnails into .png.
This must be done on the target machine / macOS version because the rendering is the important part.
Make sure no UI (or cursor) is blocking the thumbnail preview and deactivate any screen savers.
4) postprocess-crop.py crops all app screenshots to only include the window content.
Note: Images are scaled, so expect blur and slightly off color values.
5) postprocess-collage.py arranges all cropped app images in a single file.
6) analyze.py evaluates all rendered .png files for a pixel-perfect match and print out a format-support matrix table.
¹ The script tests both, compressed and uncompressed, RGB data.