vslavik/diff-pdf
Diff Pdf
diff-pdf is a visual comparison tool for PDF files that identifies differences between two documents. It functions as both a command line utility for verifying if documents are visually identical and a visualizer for pinpointing specific changes.
The project provides a graphical interface for manual inspection, featuring zoom and offset controls to analyze visual shifts. It also generates difference maps that visually highlight the specific areas where two PDF documents differ.
The tool supports automated regression testing by returning status codes to indicate whether pixel-level discrepancies exist between versions. It achieves this by rasterizing PDF content into images to detect changes regardless of the internal document structure.
Features
- PDF Difference Visualizers - Ships a graphical interface for side-by-side PDF comparison with zoom and offset controls.
- PDF Comparison Tools - Identifies visual differences between two PDF files and generates highlight maps of the changes.
- Visual Identity Verifiers - Provides a command-line utility that verifies if two PDF documents are visually identical using status codes.
- Difference Map Generation - Generates visual highlight maps by computing pixel-level differences between two rendered PDF pages.
- PDF to Image Rendering - Translates vector-based PDF content into raster images for pixel-level analysis.
- Pixel-Level Image Comparison - Compares PDF documents by converting pages to bitmaps and analyzing pixel-level discrepancies.
- Visual Regression Testing - Automatically detects unintended visual changes in PDF outputs across different versions.
- Difference Map Exports - Produces a new PDF file that visually highlights the specific areas where two documents differ.
- Visual Auditing - Allows pinpointing content shifts between PDF versions through generated visual difference maps.
- Visual Content Inspection - Provides a side-by-side graphical interface for manually verifying visual alignment and edits in PDFs.
- Visual Render Inspection - Features a graphical interface with zoom and offset controls for manually verifying visual shifts in PDFs.
- Regression Status Reporting - Returns binary exit codes to indicate visual discrepancies, enabling integration into automated regression pipelines.
- Document - Provides coordinate-based offsets to align two PDF documents, correcting for margin or positioning errors.
