Point sampling (or nearest-neighbor interpolation) filtering option uses the color of the bitmap pixel closest to the pixel center for the pixel color. This filtering option has low bandwidth cost, but also has low quality.
Bilinear interpolation filtering option calculates the pixel color using four nearest bitmap pixels to the pixel center. Their colors are combined by weighted average according to the distance. In comparison to point sampling filtering option, bilinear interpolation has higher quality, but bandwidth cost is increased.