j-stitch

Scrolling screenshot stitching for Python, implemented in Rust.

Finds the vertical overlap between two consecutive screenshots by hashing each pixel row and running a longest-common-substring match over the hash sequences, then splices the images. Optionally detects whether the second image belongs above or below the first.

The distribution is j-stitch; the module imports as longstitch.

import longstitch

result = longstitch.stitch(png_bytes_1, png_bytes_2)
if result is None:
    print("the two images do not overlap")
else:
    open("stitched.png", "wb").write(result.png)

stitch() returns None when no overlap is found -- that is a legitimate outcome, not a failure. Decode and encode failures raise longstitch.StitchError.

Windows x86_64, CPython 3.11+ (abi3). Part of jietuba. MIT licensed.