Gg, Google Scholar only finds one paper by RG Keys on this topic: Cubic Convolution Interpolation for Digital Image Processing RG KEYS IEEE TRANSACTIONS ON ACOUSTICS, SPEECH, AND SIGNAL PROCESSING, VOL. ASSP-29, NO. 6, DECEMBER 1981 I was able to download a pdf of that paper using my institutional access, and I don't think it would be a violation of anything if I send you a personal copy. Would that solve the problem? -- Bill ______________ ______________ ______________ ______________ Sent via the CNPRC Email system at primate.ucdavis.edu _______________________________________________ Gimp-developer mailing list Gimp-developer@xxxxxxxxxxxxxxxxxxxxxx https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-developer