Bug: TiltShiftFilter egdes blured with white color

[shevernitskiy]

I experience unwanted behaviour on the edges of filtered image. Look at the left bottom corner and partly at right bottom. Maybe when the algorithm has no information about neighbour pixel color, it treat it as white?

settings:

width: 1280
height: 720

start: [600,0]
end: [600,720]
blur: 12.9

filtered

original