A method for generating a seismic image, comprising the steps of providing an input trace corresponding to seismic signals received at a receiver at a known receiver depth, using the input trace to generate a series of angle traces, each having a known time dip, for each angle trace, determining a filter H, for each angle trace, correcting the data by using the inverse of the filter H to generate a plurality of deghosted angle traces, copying each deghosted angle trace to a plurality of output locations and applying in each case the time dip for that angle trace so as to generate a plurality of corrected angle traces, at each output location summing a plurality of the corrected angle traces at that output location so as to generate a replacement trace; and using the replacement trace, preferably in combination with other replacement traces, to generate a seismic image.