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Krzysztof kuhy Rudnicki
95a1f62fc4
The diffusion route generates at SDXL's native 1024px, so a 32px icon is a 32x downscale. Detail that survives the generator does not survive that reduction -- a coin's struck emblem, a shield's radial pattern and a lantern's glass panes all mush at 32px and read clearly at 64px. max_colors is deliberately NOT scaled with the canvas. Measured over the 300 genuine 48x48 icons in ~/opengameart-downloads: p50=9 p90=13 max=14. A cap of 32 rejects 0.00% of that art and so does every larger cap, so hand-made art does not spend more colours on a bigger canvas. Raising it would only admit more un-quantized generator output. Gates 18/18: the 12 original bake-off subjects re-finished at 64px, plus six subjects the route had never seen (lantern, axe, boots, helmet, torch, mushroom). Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01T9rQ12yZ7sJxiPQTCS5dUF
35 lines
1.4 KiB
TOML
35 lines
1.4 KiB
TOML
# Pixel-art item icon at 64x64: same style as `pixel_icon`, larger canvas.
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#
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# WHY THIS EXISTS. The diffusion route generates at SDXL's native 1024px, so a
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# 32px icon is a 32x downscale. Fine detail that survives the generator does not
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# survive that reduction: a coin's struck emblem, a shield's radial pattern and
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# a lantern's glass panes all mush at 32px and read clearly at 64px.
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#
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# CALIBRATION. `max_colors` is deliberately NOT raised from pixel_icon's 32.
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# Measured over the 300 genuine 48x48 icons in ~/opengameart-downloads -- the
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# largest real-art sample available locally above 32px:
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# p50=9 p75=11 p90=13 p95=13 p99=14 max=14
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# Rejection rate of that real art: cap 32 -> 0.00%, and every larger cap also
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# 0.00%. Hand-made art does not spend more colours just because the canvas grew,
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# so raising the cap would only admit more un-quantized generator output. The
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# cap stays where the corpus puts it.
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#
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# min_margin scales with the canvas: 1px of 32 is 3.1%, so 2px of 64 keeps the
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# same proportional breathing room rather than tightening it.
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name = "pixel_icon_64"
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canvas = [64, 64]
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max_colors = 32
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alpha_binary = true
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min_margin = 2
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# Same gates and same ordering as pixel_icon -- see that file for why
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# ALPHA_NOT_BINARY must come first.
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gates = [
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"ALPHA_NOT_BINARY",
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"TOO_MANY_COLORS",
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"CANVAS_SIZE",
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"SCALE_NOT_INVARIANT",
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"SILHOUETTE_LOW_CONTRAST",
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"MARGIN_TOO_SMALL",
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]
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