서명 및 인장 추출
스캔된 서류에서 필기 서명과 빨간색 인장을 자동 추출하고 HSL 보정으로 배경 얼룩을 제거하여 투명 PNG로 분리합니다.
파일을 여기로 드래그 앤 드롭하거나 클릭하여 찾아보기
or
크로미넌스(색차) 추출 알고리즘을 적용하여 어두운 종이의 그림자를 지우고 얼룩진 배경을 표백하여 고정밀 서명/인감을 보존합니다.
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.
사용방법
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.
이 도구 정보
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.
사용 사례
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.
자주 묻는 질문
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.