GIMP tools - BDA

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Center – set the coordinates of the flare centre. As mentioned
above, you can select the centre manually by a mouse-click in the
desired location of the preview window. Or you can enter precise X
and Y coordinates. Choose the measurement units from the list
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Press OK.
Parameters – specify certain flare characteristics;
Radius – specify the flare radius; the higher the value, the
larger the flare;
Rotation – flare turning angle;
Hue rotation – change the glare colour. Once the slider of
the Hue rotation scale is moved, the glare colour changes;
Vector angle – each flare has a tiny light line, i.e. direction
vector. When the slider of the Vector angle scale is moved,
the inclination angle of the line changes;
Vector length – change the length of the light line;
Adaptive supersampling – the settings of this group control the
level of flare smoothing;
Lens flare
This filter creates a reflection, a flare in the image.
How to use this filter?