58 lines
2.4 KiB
Markdown
58 lines
2.4 KiB
Markdown
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# Project images
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```
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Status: Current
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Owner: <who maintains this>
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Last reviewed: <YYYY-MM-DD>
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Governs: docs/data/img/** — the three files and their sizes
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Review trigger: A rebrand; any change to a required name, dimension or ceiling;
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any change to what the consumer accepts.
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```
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Three files, all **webp**, all **required**, at exactly these names:
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| File | Dimensions | Aspect | Typical weight |
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| --- | --- | --- | --- |
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| `icon.webp` | **512 × 512** | 1:1 | 8–60 KB |
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| `logo.webp` | **1024** on the long edge | whatever the lockup is | 20–190 KB |
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| `banner.webp` | **2176 × 725** | 3:1 | 30–130 KB |
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**Not `icon.ico`.** The consumer checks the file's magic bytes, not its name: a
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`.ico`, or a PNG renamed to `.webp`, is refused with a 415 and the project falls
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back to an initials tile. That signature check is what makes it safe to render
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these inline, so it is not going to be relaxed.
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**512 KB is a hard ceiling per file**, enforced in code — the size is read from
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the listing before the bytes are fetched, so an oversized asset is never
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downloaded and simply never appears. Nothing enforces the dimensions, which is
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why they are written down.
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## Making them
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```bash
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magick logo-source.png -resize 512x512 -quality 82 icon.webp
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identify -format '%f %wx%h %b\n' *.webp # check before committing
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```
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Quality 80–85 suits a flat mark. If a file lands over ~200 KB it is usually a
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photographic banner that wants a lower quality rather than fewer pixels.
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## Why these numbers
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The icon renders small — a 44 px tile in a list, 58 px on a project header — so
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512 covers the densest display several times over; the reference project
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deliberately halved it from 1024. The banner spans a card about 760 px wide, so
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~2176 covers it at 2×, and its 3:1 shape matters more than its width because the
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header crops to fill. The logo has no fixed frame, so only its long edge is
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specified.
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Extra sizes and variants are welcome beside these — `icon-512.webp`,
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`logo-dark.webp`. Only the three exact names are checked for.
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No placeholders ship with this template. An empty file is the worst of the three
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states: a check that asks whether the path exists calls it present, and anything
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reading the bytes rejects it. Absent is honest, and the conformance check reports
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it as absent — which is what gets it filled in.
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Why the requirement exists, and what reads it: [`../README.md`](../README.md).
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