38 lines
1.0 KiB
Python
38 lines
1.0 KiB
Python
 
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# -*- coding: utf-8 -*-
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"""Make near-black logo background transparent."""
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from pathlib import Path
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from PIL import Image
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ROOT = Path(__file__).resolve().parents[1]
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FILES = [
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ROOT / "apps/web/public/brand/logo.png",
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ROOT / "apps/web/public/brand/montactLogo.png",
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]
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def knockout(src: Path) -> None:
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im = Image.open(src).convert("RGBA")
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pixels = im.load()
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w, h = im.size
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for y in range(h):
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for x in range(w):
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r, g, b, a = pixels[x, y]
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luma = 0.2126 * r + 0.7152 * g + 0.0722 * b
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chroma = max(r, g, b) - min(r, g, b)
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# Keep teal M (has chroma). Knock out near-black / gray canvas.
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if luma < 28 and chroma < 18:
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pixels[x, y] = (r, g, b, 0)
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elif luma < 48 and chroma < 22:
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pixels[x, y] = (r, g, b, int(a * (luma - 28) / 20))
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im.save(src)
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print(f"updated {src}")
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if __name__ == "__main__":
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for path in FILES:
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if path.exists():
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knockout(path)
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else:
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print(f"missing {path}")
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