e-Ink 전자잉크 리더 최적화
전자잉크 이북 리더기 전용 PDF 보정: 오츠 알고리즘 이진화로 회색 배경을 표백하고 미세 폰트 획을 확장 및 가공합니다.
e-Ink 대비 최적화
전자잉크(e-Ink) 화면 대비 최적화를 위해 PDF 전자책을 여기에 드래그 앤 드롭하십시오.
파일을 여기로 드래그 앤 드롭하거나 클릭하여 찾아보기
or
전자잉크(e-Ink) 화면 대비 최적화를 위해 PDF 전자책을 여기에 드래그 앤 드롭하십시오.
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 Scanned PDF
Upload e-books or scanned documents with faint text or gray backgrounds.
Adjust Contrast Slider
Drag the damped slider to balance background removal and character bolding in real-time.
Optimize and Download
Process the entire PDF to generate a high-contrast, eye-friendly document tailored for e-Ink.
이 도구 정보
e-Ink Reader Optimizer is a must-have tool custom-made for e-Reader enthusiasts using Kindle, Onyx Boox, Kobo, or other e-paper devices.
Many scanned PDF e-books suffer from faint lettering, muddy gray backgrounds, noise, or scan shadows when viewed on e-Ink screens. This tool analyzes gray-value histograms and applies Otsu's Binarization Thresholding to separate text from background, converting gray backdrops to clean white.
Additionally, it integrates morphological dilation to bold and thicken thin, faded characters, providing crisp, high-contrast typography. The inertia-damped contrast slider allows you to fine-tune the paper-like contrast in real-time.
사용 사례
Ancient Manuscript Restoration
Thicken faded text in scans of historical books or handwritten manuscripts to make them readable.
Exam Sheet Clean-up
Bleach background shadows from photocopied or photographed exams, returning clean black text on white paper.
E-paper Device Tailoring
Convert colored PDFs to optimized grayscale, preventing messy, dithering artifacts on monochrome screens.
자주 묻는 질문
Have questions? Find quick answers about this tool here.
In image processing, this is called dilation. It uses a structuring matrix to expand character margins by a pixel, physically thickening faint strokes to make them legible.
Quite the opposite. By binarizing complex color/grayscale images to simple black-and-white layouts, standard compression (like CCITT Group 4) can shrink the PDF file size significantly.
Yes. Native vector PDFs are rasterized at high resolutions in the background, optimized, and compiled back, ensuring unified high-contrast reading.