evanw · nigeltao · Sep 11, 2024
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+þ��g��wW�H����Xx��
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diff --git a/testdata/HBkSHYSIeHiPiHh8eJd4eTN0EEQG.png b/testdata/HBkSHYSIeHiPiHh8eJd4eTN0EEQG.png
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diff --git a/testdata/README.md b/testdata/README.md
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+# Thumbhash Test Data
+
+This directory holds the https://evanw.github.io/thumbhash/ examples as
+individual files.
+
+The `*.th` files hold thumbhash-encoded data, prepended with a 3-byte magic
+string so that `/usr/bin/file` (if its Magdir database was updated) or similar
+programs can identify the data as thumbhash-formatted data.
+
+That 3-byte magic string is "\xC3\xBE\xFE", which is arbitrary and not part of
+the original thumbhash description or implementation. But "\xC3\xBE" is the
+UTF-8 encoding of 'þ' (U+00FE LATIN SMALL LETTER THORN) and "\xFE" is invalid
+UTF-8 but is the ISO-8859-1 encoding of 'þ'. The Old English letter 'þ' is
+pronounced like the "th" that starts "thumbhash".
+
+The `*.png` files hold the decodings of the `*.th` files, as produced by that
+web page. Its JavaScript PNG encoder favors implementation simplicity over
+maximizing compression ratio.
+
+The filenames' base names are the base64url encoding (similar to but slightly
+different from the base64std encoding used on that web page) of the thumbhash
+data (without the magic string).
diff --git a/testdata/VggKDYAW6lZvdYd6d2iZh_p4GE_k.png b/testdata/VggKDYAW6lZvdYd6d2iZh_p4GE_k.png
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diff --git a/testdata/YJqGPQw7sFlslqhFafSE-Q6oJ1h2iHB2Rw.png b/testdata/YJqGPQw7sFlslqhFafSE-Q6oJ1h2iHB2Rw.png
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