Pengoptimum Pembaca e-Ink
Optimumkan kontras dan susun atur PDF agar tajam dan jelas dibaca pada peranti e-Ink.
e-Ink Contrast Optimizer
Drag and drop your PDF e-book here to optimize for e-Ink paper contrast.
Upload Scanned PDF
About This Tool
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.
How to Use
Muat Naik Fail
Pilih fail dari peranti anda atau seret dan lepaskan ke sini.
Pilih Pilihan
Sesuaikan tetapan mengikut keperluan dokumen anda.
Proses dan Muat Turun
Klik butang muat turun setelah fail selesai diproses.
Use Cases
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.
Frequently Asked Questions
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.