View part of your screen in grayscale or simulated color vision deficiency.

Overview

monolens

View part of your screen in grayscale or filtered to simulate color vision deficiency.

Watch the demo on YouTube.

Install with pip install monolens and then run monolens in a terminal or do it in one command with pipx run monolens.

Monolens was featured on Twitter by Matthew Feickert and Matplotlib, and picked up in this episode of Python Bytes. Thanks, guys!

Usage

  • Drag the lens around by holding a Mouse button down inside the window
  • Press Escape, Q, or double click on the lens to quit
  • Press up, down, left, right to resize the lens
  • Press Tab to switch between greyscale and different forms of simulated colorblindness
  • Press I to switch view label on/off
  • Press M to move the lens to another screen

On OSX, you need to give Monolens permission to make screenshots, which is safe.

Known limitations

  • The app is tested on OSX and Linux. It may flicker when you move the lens (less so on OSX). If you know how to fix this, please help. :)
  • Pulling the lens to another screen is currently not supported. See usage on how to switch screens instead.
  • The lens actually uses a static screenshot which is updated as you move the lens around. This trick is necessary, because an app cannot read the pixels under its own window. Because of this, the pixels under the app are only updated when you move the lens away first and then back. This is also the reason why the lens only works for static images.
  • On OSX, an ordinary app is not allowed to read pixels outside of its window for security reasons, which is why this app needs special permissions. Giving permissions is safe; Monolens contains no networking code and will neither store nor send your pixels anywhere.

Future plans

  • Support gestures to rescale the lens (pinch etc)
Comments
  • GitHub Action to lint Python code

    GitHub Action to lint Python code

    Output: https://github.com/cclauss/monolens/actions

    Future PRs should remove || true from:

    • [ ] isort --check-only --profile black . || true
    • [ ] pytest . || true
    opened by cclauss 1
  • Monolens sees through open application windows

    Monolens sees through open application windows

    When I open monolens on OSX 10.15.7 (Catalina) the viewer window always appears to peer through any of the application windows I have open and show only the desktop. For example, in the screenshot below I have a PDF document open in Preview but the monolens window views through it to the desktop image (which I have as the default OSX Catalina one):

    image

    or here when I call it using pipx:

    image

    I am not sure if this is in any way related to the permissions setup described in the project README,

    On OSX, you need to give Monolens permission to make screenshots, which is safe.

    I am unsure how to actively give those permissions.

    Any ideas?

    opened by dantrim 1
  • Using published package on pypi doesn't work because readme is not found

    Using published package on pypi doesn't work because readme is not found

    ❯ monolens
    Traceback (most recent call last):
      File "/home/maxnoe/.local/bin/monolens", line 8, in <module>
        sys.exit(main())
      File "/home/maxnoe/.local/lib/python3.9/site-packages/monolens/__init__.py", line 25, in main
        intro = Intro()
      File "/home/maxnoe/.local/lib/python3.9/site-packages/monolens/intro.py", line 17, in __init__
        with open(Path(__file__).parent / ".." / "README.md") as f:
    FileNotFoundError: [Errno 2] No such file or directory: '/home/maxnoe/.local/lib/python3.9/site-packages/monolens/../README.md'
    
    opened by maxnoe 1
  • Fix wrong method name in enterEvent

    Fix wrong method name in enterEvent

    Fixes this error:

    Traceback (most recent call last):
      File "/home/maxnoe/.local/lib/python3.9/site-packages/monolens/widget.py", line 48, in enterEvent
        super(Widget, self).eventEvent(event)
    AttributeError: 'super' object has no attribute 'eventEvent'
    

    When entering with the mouse.

    opened by maxnoe 1
  • [pre-commit.ci] pre-commit autoupdate

    [pre-commit.ci] pre-commit autoupdate

    opened by pre-commit-ci[bot] 0
  • Missing wayland support

    Missing wayland support

    I tried monolens under wayland with the sway window manager via pipx and it crashed with

    On OSX, you need to give Monolens permission to make screenshots, which is safe.
    Traceback (most recent call last):
      File "/home/michael/.local/pipx/.cache/ec49a1adcc18bdc/bin/monolens", line 8, in <module>
        sys.exit(main())
      File "/home/michael/.local/pipx/.cache/ec49a1adcc18bdc/lib/python3.9/site-packages/monolens/__init__.py", line 46, in main
        lens = Lens()
      File "/home/michael/.local/pipx/.cache/ec49a1adcc18bdc/lib/python3.9/site-packages/monolens/lens.py", line 35, in __init__
        self._updateScreenshot(self.screen())
      File "/home/michael/.local/pipx/.cache/ec49a1adcc18bdc/lib/python3.9/site-packages/monolens/lens.py", line 187, in _updateScreenshot
        self._updateConverted()
      File "/home/michael/.local/pipx/.cache/ec49a1adcc18bdc/lib/python3.9/site-packages/monolens/lens.py", line 191, in _updateConverted
        util.grayscale(self._converted, self._screenshot)
      File "/home/michael/.local/pipx/.cache/ec49a1adcc18bdc/lib/python3.9/site-packages/monolens/util.py", line 66, in grayscale
        s = qimage_array_view(source)
      File "/home/michael/.local/pipx/.cache/ec49a1adcc18bdc/lib/python3.9/site-packages/monolens/util.py", line 45, in qimage_array_view
        assert format == QtGui.QImage.Format_RGB32
    AssertionError
    

    I'm not entirely surprise, since screenshotting utilities etc. are different under wayland. But from the stacktrace it's not obvious why exactly it crashed and in theory, Qt should be able to handle wayland, or shouldn't it?

    Anyway, would be cool if someone else could try it and if they can reproduce it, add it to the limitations in the readme, after all wayland is slowly becoming more mainstream. But maybe just something with my system configuration is broken :man_shrugging:

    opened by meliache 3
Owner
Hans Dembinski
Particle physicist, C++ and Python expert, statistician. Author of boost::histogram.
Hans Dembinski
Tools for writing, submitting, debugging, and monitoring Storm topologies in pure Python

Petrel Tools for writing, submitting, debugging, and monitoring Storm topologies in pure Python. NOTE: The base Storm package provides storm.py, which

AirSage 247 Dec 18, 2021
Getting started with Python, Dash and Plot.ly for the Data Dashboards team

data_dashboards Getting started with Python, Dash and Plot.ly for the Data Dashboards team Getting started MacOS users: # Install the pyenv version ma

Department for Levelling Up, Housing and Communities 1 Nov 08, 2021
BGraph is a tool designed to generate dependencies graphs from Android.bp soong files.

BGraph BGraph is a tool designed to generate dependencies graphs from Android.bp soong files. Overview BGraph (for Build-Graphs) is a project aimed at

Quarkslab 10 Dec 19, 2022
Lightweight, extensible data validation library for Python

Cerberus Cerberus is a lightweight and extensible data validation library for Python. v = Validator({'name': {'type': 'string'}}) v.validate({

eve 2.9k Dec 27, 2022
paintable GitHub contribute table

githeart paintable github contribute table how to use: Functions key color select 1,2,3,4,5 clear c drawing mode mode on turn off e print paint matrix

Bahadır Araz 27 Nov 24, 2022
Data Analysis: Data Visualization of Airlines

Data Analysis: Data Visualization of Airlines Anderson Cruz | London-UK | Linkedin | Nowa Capital Project: Traffic Airlines Airline Reporting Carrier

Anderson Cruz 1 Feb 10, 2022
Use Perspective to create the chart for the trader’s dashboard

Task Overview | Installation Instructions | Link to Module 3 Introduction Experience Technology at JP Morgan Chase Try out what real work is like in t

Abdulazeez Jimoh 1 Jan 22, 2022
Fastest Gephi's ForceAtlas2 graph layout algorithm implemented for Python and NetworkX

ForceAtlas2 for Python A port of Gephi's Force Atlas 2 layout algorithm to Python 2 and Python 3 (with a wrapper for NetworkX and igraph). This is the

Bhargav Chippada 227 Jan 05, 2023
基于python爬虫爬取COVID-19爆发开始至今全球疫情数据并利用Echarts对数据进行分析与多样化展示。

COVID-19-Epidemic-Map 基于python爬虫爬取COVID-19爆发开始至今全球疫情数据并利用Echarts对数据进行分析与多样化展示。 觉得项目还不错的话欢迎给一个star! 项目的源码可以正常运行,各个库的版本、数据库的建表语句、运行过程中遇到的坑以及解决方式在笔记.md中都

31 Dec 15, 2022
SummVis is an interactive visualization tool for text summarization.

SummVis is an interactive visualization tool for analyzing abstractive summarization model outputs and datasets.

Robustness Gym 246 Dec 08, 2022
This is a sorting visualizer made with Tkinter.

Sorting-Visualizer This is a sorting visualizer made with Tkinter. Make sure you've installed tkinter in your system to use this visualizer pip instal

Vishal Choubey 7 Jul 06, 2022
PyFlow is a general purpose visual scripting framework for python

PyFlow is a general purpose visual scripting framework for python. State Base structure of program implemented, such things as packages disco

1.8k Jan 07, 2023
Tidy data structures, summaries, and visualisations for missing data

naniar naniar provides principled, tidy ways to summarise, visualise, and manipulate missing data with minimal deviations from the workflows in ggplot

Nicholas Tierney 611 Dec 22, 2022
Cartopy - a cartographic python library with matplotlib support

Cartopy is a Python package designed to make drawing maps for data analysis and visualisation easy. Table of contents Overview Get in touch License an

1.2k Jan 01, 2023
The Timescale NFT Starter Kit is a step-by-step guide to get up and running with collecting, storing, analyzing and visualizing NFT data from OpenSea, using PostgreSQL and TimescaleDB.

Timescale NFT Starter Kit The Timescale NFT Starter Kit is a step-by-step guide to get up and running with collecting, storing, analyzing and visualiz

Timescale 102 Dec 24, 2022
649 Pokémon palettes as CSVs, with a Python lib to turn names/IDs into palettes, or MatPlotLib compatible ListedColormaps.

PokePalette 649 Pokémon, broken down into CSVs of their RGB colour palettes. Complete with a Python library to convert names or Pokédex IDs into eithe

11 Dec 05, 2022
Political elections, appointment, analysis and visualization in Python

Political elections, appointment, analysis and visualization in Python poli-sci-kit is a Python package for political science appointment and election

Andrew Tavis McAllister 9 Dec 01, 2022
2021 grafana arbitrary file read

2021_grafana_arbitrary_file_read base on pocsuite3 try 40 default plugins of grafana alertlist annolist barchart cloudwatch dashlist elasticsearch gra

ATpiu 5 Nov 09, 2022
An open-source plotting library for statistical data.

Lets-Plot Lets-Plot is an open-source plotting library for statistical data. It is implemented using the Kotlin programming language. The design of Le

JetBrains 820 Jan 06, 2023
Import, visualize, and analyze SpiderFoot OSINT data in Neo4j, a graph database

SpiderFoot Neo4j Tools Import, visualize, and analyze SpiderFoot OSINT data in Neo4j, a graph database Step 1: Installation NOTE: This installs the sf

Black Lantern Security 42 Dec 26, 2022