Screen Filter - A fullscreen perceptual greyscale filter for Windows

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Screen Filter

A fullscreen filter for Windows.

Features

  • Configurable hotkeys to toggle the filter.

  • Refresh rate limiting.

  • Start with windows.

  • OkLab and Lab based grayscale filtering.

  • Freeze the filter to take screenshots.

  • Multi monitor support.

Why?

In digital painting, we usually use a neutral color filled saturation layer put on top of other layers to check image greyscale.

This approach is not rigorous, as the saturation layers in Photoshop, SAI, and Krita modifies the saturation in HS(C)Y color model. If the saturation is overridden to 0, the Y channel appears, which is interpreted by most artists as lightness.

Besides, the color filter accessibility feature that is built-in for Windows also use this approach, which results in inaccurate lightness.

This application instead, use OkLab and Lab color models, and outputs the L channel. As these models are perceptual color models, the L channel is the real lightness, the lightness your eye feel.

Screenshots

oklch_picker
oklch_picker1309×814 51.7 KB

From OKLCH Color Picker & Converter

Credits

Color model converting code is translated from bevy project under MIT license.

Github: GitHub - 443eb9/screen_filter

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