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by mikewarot 1233 days ago
Stand in one place, take several pictures as the person walks/rides across, then use Hugin[1] to align the images, outputting each as a TIF. Then import those as layers, and use masking to compose them into the final image with GIMP[2].

If you're more prepared, you could just use a tripod to skip the need for alignment.

[1] https://hugin.sourceforge.io/

[2] https://www.gimp.org/