Image of simulated data of a source outside the field of view with classical gridding (left panel) and image domain gridding (right panel). The color-scale for both images is the same, ranging from –1.0e-03 Jy beam⁻¹ to 1.0e-03 Jybeam⁻¹. Position of the source is just outside the image to the north. The aliased position of the source within the image is indicated by an “X”. The image is the convolution of the PSF with the actual source and all its aliases. In the image for the classical gridder (left panel), the PSF around the alias is just visible. In the image for the image domain gridder (right panel), the alias is almost undetectable. The better alias suppressionhas little effect on the overall rms value since this is dominated by the side lobes of the PSF around theactual source. The rms value over the imaged area is 2% lower for image domain gridding (1.35 Jy beam⁻¹) than for classical gridding (1.38e-03 Jy beam⁻¹).