Interpolation of the point-source field flux onto a regular pixel grid. The left panel shows the interpolation result for two, unit-flux point sources located at (0.5, 0.5) (center of the pixel) and at (2.75, 2.6) on a 4 × 4 pixel grid. The location of the point sources is marked with a red cross. The right panel displays a random realization of 1000 uniformly distributed point sources on a 128 × 128 pixel grid with flux values uniformly distributed between 0 and 100. A white rectangle in the lower-left corner indicates a region of the same size as that shown in the left panel, providing a spatial scale reference.