Translations:Archive:Kdenlive/Manual/Effects/Alpha manipulation/Color Selection/21/en

Determines the shape of the color subspace. Options are: box, ellipsoid or diamond. Box is the biggest of them (by volume) and diamond the smallest. Imagine an octahedron inscribed inside an ellipsoid, which is in turn inscribed in a box. The tips of the diamond touch the ellipsoid, and the box, at the center of the sides of the box.