raster image of paint-grad-15-t

Test linear and radial gradient defaults. Includes testing defaults for linear grad x1,y1,y2 = 0.0, x2 = 1.0 and testing defaults for radial grad cx,cy,r = 0.5

The top rectangle must be blue at the lefthand side and red at the right hand side, fading smoothly accross. The lower rectangle must be red at the edges with a black centre to the radial gradient at the centre of the rectangle, and the gradient occupying the whole rectangle.