examples: Add a few example prints from NIST

These prints are from NIST and are not copyrighted. PNG files are provided where the print is stored in the alpha channel (for consumption by test scripts).
2026-06-11 18:38:07 +00:00 · 2019-06-10 16:55:57 +02:00
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+These are example images from NIST and are not copyrighted.
+
+The PNG files have been generated by using the greyscale data as a mask.