This filter creates a linear blur in a direction determined by the « Angle » option. The default direction is horizontal to the right (0.000 degree).
These options are common to GEGL-based filters. Please refer to Section 2, « Options communes ».
In this case, « Length » represents the blur intensity. More Length will result in more blurring.
« Angle » describes the direction of the movement. Thus, a setting of 90 will produce a vertical blur, and a setting of 0 will produce a horizontal blur.
Explained in Section 3.4, « Pixéliser ».
This option (default) allows you to modify blur settings directly on canvas, for easier visual tweaking of blur settings. It displays a line with handle on both ends to vary direction and transform.
Press Ctrl key to change direction by 15° steps.