docs: detailed ash-wallpaper usage guide with parameter reference and recipes
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@@ -65,9 +65,9 @@ tools/ash-wallpaper.sh photo.jpg # -> photo-ash.png, dark base
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PRESET=light tools/ash-wallpaper.sh photo.jpg # light variant base
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```
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Tuning via environment variables: `HUE_MAX`/`HUE_MIN` (width of the warm hue
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band), `SAT_MIN`/`SAT_MAX` (how colourful a pixel must be to survive),
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`EMBER_BOOST` (saturation of highlights), `BASE_LO`/`BASE_HI` (grey ramp).
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See **[tools/ash-wallpaper.md](tools/ash-wallpaper.md)** for the full
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parameter guide, hue reference of the Ash palette and ready-made recipes
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(sunsets, night cities, portraits, near-monochrome).
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## Regenerating from the palette
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