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
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