Abstract: Pixel-based image data are subsampled for transmission to a printer and later bilinear interpolation in the printer. The transmission system evaluates the error that will remain after interpolation. In response to this evaluation, the transmission system also forms trim data for later application to the interpolated subsample to remove a significant part of the error. Preferably trim data points are selected based on relative importance of the associated correction--specifically, size of the error that will remain after interpolation--but also the amount of trim data is controlled to maintain a significant advantage in overall transmission time, relative to transmitting the entire image-data set. The amount of trim data is held roughly to a certain fraction, about five percent, of the number of points in each data block (e. g., swath), essentially independent of the error evaluation.