Quality 82 went on every rung, so a picture 173 CSS pixels wide in a gallery grid carried the same
fidelity as the copy somebody opens full screen. Compression artefacts scale with display size: at
thumbnail size 74 is indistinguishable from 82 and 15% smaller — 108,388 bytes to 92,568 on the worst
image in this gallery, measured rather than assumed.
640 is the line because it is the widest rung a phone picks for a grid slot. Above it something is
showing the picture large, and 82 is the right answer again.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
pastilhasandClaude Opus 5
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