Graustufen — Foto lokal umwandeln
0.90
Schritte: choose files, adjust options, export. Beispiel: sample color blocks demo. Prozess: local in browser, no upload. Tool: Rec.601 grayscale conversion, keep alpha when PNG/WebP. Soft limits ~25MB / 8192px apply.
So funktioniert es
Pick a photo, apply grayscale, download. Processing never leaves this tab.
Regeln
For each pixel Y=0.299R+0.587G+0.114B; R=G=B=Y; alpha unchanged.
- Rec.601 coefficients match common luma practice.
- Alpha channel is copied unchanged.
- Export re-encodes; JPEG drops alpha.
- Animated GIF: first frame only.
Beispiel
Sample four-color blocks become gray with distinct brightness levels.
Gute Einsätze
- Print preview without color ink assumptions.
- Accessibility contrast drafts.
- Stylized black-and-white exports.
Frequently asked questions
Uploaded?
No—everything is local.
Which formula?
Rec.601: 0.299R+0.587G+0.114B.
Can I undo?
Not after download; keep the original file.
Same as CSS filter?
We rewrite pixels, so the saved file is truly grayscale.
Transparent PNG?
Transparency is kept when exporting PNG/WebP.
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Fragen oder Feedback
Unklar, kaputt oder etwas fehlt? Schreib unten eine Nachricht — wir lesen jede Notiz zu diesen Tools.