mapbox/pixelmatch
Pixelmatch
pixelmatch is a JavaScript image comparison library and pixel-level difference detector. It identifies mismatched pixels between image data arrays and quantifies the differences based on a configurable sensitivity threshold.
The tool generates visual difference maps that highlight specific pixel changes for manual review. It includes a command-line interface for comparing image files and exporting the resulting difference maps to the file system.
The project provides capabilities for automated image analysis and visual regression testing, utilizing anti-aliasing heuristic filtering to ignore changes caused by sub-pixel rendering.
Features
- Visual Regression Testing - Serves as a tool for detecting visual regressions by comparing baseline images against current screenshots.
- Image Analysis - Implements a JavaScript library for detecting mismatched pixels and quantifying differences between image arrays.
- Pixel Analyzers - Inspects pixel-level color data to identify and count mismatched pixels between two images.
- Difference Map Generation - Generates visual difference maps that highlight specific pixel changes for manual review.
- Image Comparison Libraries - Provides a JavaScript library for pixel-level image comparison and visual difference map generation.
- Spatial Difference Mapping - Generates pixel-by-pixel maps to visualize visual artifacts and differences between images.
- Visual Difference Analyzers - Produces spatial maps that visually highlight exactly where two images differ.
- Color Difference Thresholding - Identifies mismatched pixels by calculating the distance between color values against a configurable sensitivity limit.
- Image Comparison Utilities - Provides utilities for analyzing and diffing visual assets to detect pixel-level changes between versions.
- Low-Level Pixel Buffer Access - Provides direct access to contiguous memory buffers for high-throughput pixel-level comparison.
- CLI Image Processing Tools - Ships a command-line utility for comparing image files and exporting resulting difference maps.
- Anti-Aliasing Detection - Implements a heuristic filter to ignore pixel changes caused by sub-pixel rendering during image comparison.
- Image Processing - Provides image processing capabilities to compare two data arrays and count mismatched pixels.
- JavaScript Geospatial Libraries - Pixel-level image comparison library.
- Image Processing - Fast, pixel-level image comparison library.
