graphics card with opengl 3.3 support or better

The format your display is in by default. You will want to set the preferred output format to the one closest to what your display can handle to make full use of it. The HDR settings will show you the display format that Krita can handle, and the current output format. Since 4.2 Krita can not just edit floating point images, but also render them on screen in a way that an HDR capable setup can show them as HDR images. New in version 4.2: These settings are only available when using Windows. This should be enabled if you experience artifacts with the assistants. Although for now, this feature may be broken on some AMD/Radeon cards and may work fine on some Intel graphics cards. This setting utilizes the graphics card’s buffering capabilities to speed things up a bit. As the name suggests, this setting provides the best looking image during canvas operations. Only available when your graphics card supports OpenGL 3.0.

This should give a little better result than Bilinear Filtering. For most purposes this should be a good trade-off between speed and quality.

This removes the ‘blockiness’ seen during magnification and gives a smooth looking result. While fast, this results in a large number of artifacts - ‘blockiness’ during magnification, and aliasing and shimmering during minification. This is the fastest and crudest filtering method. The choice here only affects the way the image is displayed during canvas operations and has no effect on how Krita scales an image when a transformation is applied. The user can choose which scaling mode to use while zooming the canvas. Wether this works better than regular OpenGL depends on the graphics drivers of the computer. Krita will use the ANGLE compatibility layer to convert the OpenGL calls to Direct3D calls. Using this can be useful for less powerful devices. Krita will use OpenGl ES, which is a subset of OpenGL. Krita will decide the best renderer to use based on some internal compatibility checking.

Graphics card with opengl 3.3 support or better