Lanczos QML Type

A ShaderEffect that makes use of the Lanczos resampling method for scaling textures. More...

• List of all members, including inherited members

Properties

• antiRingingStrength : real
• resolution : real
• sinc : real
• source : var
• sourceSize : size
• targetSize : size
• windowSinc : real

Detailed Description

Lanczos resampling tries to preserve detail when scaling down images and thus looks less blurry compared to a simple linear interpolation.

This effect implements a single-pass Lanczos resampling filter using two lobes. Everything is done in the shader, with some defaults set for parameters. These defaults were designed to provide a good visual result when scaling down window thumbnails.

Property Documentation

antiRingingStrength : real [default: 0.65]

The amount of anti-ringing to apply.

resolution : real

The resolution of the Lanczos effect.

Larger values mean reduced (more pixelated) results. Defaults to 0.98 for good results.

sinc : real [default: 1.0]

Lanczos Sinc function factor.

source : var [required]

The source texture. Can be any QQuickTextureProvider.

sourceSize : size [required]

The size of the source texture. Used to perform aspect ratio correction.

targetSize : size

The target size of the Lanczos effect.

Defaults to the width and height of this effect.

windowSinc : real [default: 0.4]

Lanczos window Sinc function factor.