Opaque Monochrome PNG with Print Hint

Matte raster artwork white, convert all pixels to black or white and store a PNG print-resolution hint without resizing.

Content processing stays in the browser; required runtime code loads by GET. Originals/checkpoints retain their actual content and metadata. Local processing/reencoding is not secure erasure, redaction or anonymity.

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About this flow

Matte raster artwork white, convert all pixels to black or white and store a PNG print-resolution hint without resizing.

Limitations

One staticPNG/JPEG/WebP≤20MiB/4MP/8192pixels per side; every generated next-input image must fit20MiB.
Encoded-RGB weights0.2126/0.7152/0.0722,threshold0–255. Not linear-light/adaptive/dithered or guaranteed OCR/readability.
Final opaque binary-valued pixels do not imply a1-bit encoded PNG. DPI1–2400 whole steps; pHYs=round(DPI/0.0254) pixels/metre; no pixel resize.
Receiving software may ignore pHYs. No physical print-size, printer, ink-saving, color-fidelity or stencil/material guarantee.