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Description
When the point graphic is used the masks can often have several adjacent pixels included seemingly at random. Looking at the code, this is due to it using an elliptical mask with diameter 1.2 pixels centered on the point.
Would a 1 pixel x 1 pixel rectangle mask be a better choice? In most cases it would only include the pixel that the point is directly over, when the point is directly over the boundary between 2 pixels, both would be selected, and when directly over the vertex between 4 pixels, all 4 would be selected. This seems like more intuitive behaviour than what happens with the ellipse.