署名・スタンプ抽出
スキャン文書から手書き署名や印鑑スタンプの画像を抽出し、紙のシワや背景ノイズを消して透明な透過PNGに加工します。
ファイルをここにドラッグ＆ドロップするか、クリックして選択してください
or
色差抽出を適用して暗い紙の影の細部を取り除き、背景のカビや汚れを漂白して、高精度な印影を保持します。
Designed for Trust and Speed
PDFRunway handles your documents locally, keeping data secure and processing lightning-fast.
Easy to Use
Simple 3-step processes designed for speed, clarity, and non-technical users.
Fast & Reliable
High-performance local compilation keeps processing fast, secure, and responsive.
100% Secure
Your documents never leave your browser. Zero uploads, 100% client-side privacy.
Works Anywhere
Access the full suite on any browser, system, desktop, or mobile device.
使用方法
Follow these three simple steps to process your file in seconds.
Upload seal photo
Provide a phone-captured photo of your signature or stamp seal.
Adjust cleaning sliders
Move contrast and luminance sliders to isolate the background noise in real-time.
Download clean signature
Export as transparent PNG ready to be stamped onto formal document agreements.
このツールについて
The Signature & Stamp Chroma Ink Optimizer functions as a professional high-fidelity ink purifier.
Signatures or corporate seals captured on phones often suffer from yellow paper tint, uneven shadows, and page wrinkles. Pasting them directly onto contract PDFs looks amateur.
This tool separates the Alpha channel based on luminance and color space. It completely bleaches paper backgrounds while sharpening stamp red (Chroma Ink) and handwriting black. The result is a premium, transparent PNG stamp carrying genuine ink textures.
使用例
Professional e-signature prep
Convert gray signature photos into beautiful, transparent layers to sign agreements.
Corporate seal sanitizing
Clean physical stamp scans by discarding paper fiber noise, preparing crisp transparent stamp seals.
Drawn line art extraction
Isolate black strokes from drawing sketchbooks for easy Photoshop coloring workflows.
よくある質問
Have questions? Find quick answers about this tool here.
Standard chroma-keying often makes signature stroke details look blocky and pixelated. Our algorithm isolates only white/yellow background noise and smooths the ink borders.
We support JPG, JPEG, and PNG. For best results, capture your signature photo under bright, even lighting.
No. The pixel filtering acts on original coordinates, sharpening contrast while maintaining genuine stroke textures.