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SnapOtterandGitHub a75a22dd3f fix(landing): derive conversion-preset copy from real format differences (#663)
The 83 X-to-Y converter pages were generated from one template with the
format names substituted in. Three of the four features and two of the
three FAQs were byte-identical across all 82 non-override presets, every
page came out at exactly 144 words, and pages within a family sat at
roughly 61% similarity with identical shingle counts. That is the
mass-produced fingerprint, and the same shape that got the docs tool
pages deduped in #662. All 83 are indexed today, so this is prevention
rather than repair.

Copy is now derived from what actually differs between the two formats:
alpha, animation, colour depth, lossy re-encode behaviour, container
reach, and where each format is genuinely accepted. png-to-jpg explains
that transparency gets flattened; gif-to-jpg warns you keep frame one
only; psd-to-svg says to export Photoshop's real vector layers instead of
tracing them.

Mean similarity across all 3,403 pairs drops from 34.8% to 6.7%, and the
uniform 144-word length is gone (206-256 words, varying). Within-family
max is roughly flat: on the built pages, image goes 62.8% to 66.1%, video
61.3% to 66.4%, audio 60.7% to 60.6%. Generated copy has a similarity
floor, and beating it inside a family would take hand-written pages. What
has gone is the identical shingle count per family, which was the
strongest tell.

Also drops the one-off eps-to-svg override: all five vectorize presets
now get honest tracing copy, not just that one.

Verified: landing builds 798 pages, zero verbatim repeats between a
page's blurb and its own features or FAQs, biome clean.
2026-07-28 17:08:53 +08:00
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