alextran1502
pixelmatch
| alextran1502 | pixelmatch | |
|---|---|---|
| 1 | 5 | |
| - | 5,851 | |
| - | 1.1% | |
| - | 3.1 | |
| - | 9 months ago | |
| JavaScript | ||
| - | ISC License |
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alextran1502
pixelmatch
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Immich - High-performance self-hosted backup photos/videos from your mobile phone (kinda like a Google Photos replacement) - Progress update July 27th, 2022. The album feature on the web is here 🎉
I'm the dev for a javascript-based reddit bot that implements image comparisons using both pixel matching and/or perceptual hashes (that could be stored in a DB). I'd be happy to go over high-level or implementation details if its something your team would be interested in. Either on github or elsewhere.
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JS Question
There are quite a few image comparison libraries in pure Javascript for both node and browser.
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Show HN: Instantly create a GitHub repository to take screenshots of a web page
You could absolutely get this working with GitHub Actions with a bit of creativity.
I've been playing around with my own image-diff tool for this kind of thing, but it's not yet in a decent state: https://github.com/simonw/image-diff - there are other, better options out there such as https://github.com/mapbox/pixelmatch
Needle is an older system that did this using Selenium - updating that to work with Playwright (or Playwight via shot-scraper) would be an interesting project: https://github.com/python-needle/needle
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Visual Regression Testing with Playwright
Internally, Playwright Test uses the pixelmatch library to compare screenshots for visual differences. It is possible to pass several options to this library, to fine-tune the comparison of images. The most important option is the threshold option, which indicates the threshold amount of differences allowed between two images.
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An Introduction to Scraping (Almost) Anything With Puppeteer and Node.js
Other use-cases include combining screenshots with the Autocode scheduler, a file hosting platform like Box, and a package like pixelmatch to create daily screenshot diffs for regression testing.
What are some alternatives?
blockhash-js - Image perceptual hash calculation in javascript
odiff - The fastest pixel-by-pixel image visual difference tool in the world.
Cypress - Fast, easy and reliable testing for anything that runs in a browser.
loki - 👁 Visual Regression Testing for Storybook
BackstopJS - Catch CSS curve balls.
vue-testing-library - 🦎 Simple and complete Vue.js testing utilities that encourage good testing practices.
cypress-visual-regression - Module for adding visual regression testing to Cypress
TestCafe - A Node.js tool to automate end-to-end web testing.
needle - Automated tests for your CSS.
FunctionScript - An API gateway and framework for turning functions into web services
awesome-regression-testing - 🕶️ A curated list of resources around the topic: visual regression testing
mocha - ☕️ simple, flexible, fun javascript test framework for node.js & the browser