Perhaps you should tell that to Fred Miranda, who sells a Photoshop plugin. to do Stepwise, (or as he puts it stair), interpolation, and seems to be well respected for his results. He even supplies samples to compare results between his SI method and Genuine Fractals. I'm not sure where Greywolf is coming from. By my quick mental calculation using a 300 DPI as a standard then Dave is looking at more of a 3-4x linear increase in size which implies that some care should be taken. I usually settle for 250 dpi for my prints but this is for presentation...
[EMAIL PROTECTED] wrote: > Exactly. And upsizing in steps has been shown to be destructive. Every > interpolation introduces some error. You only multiply the problems by > stepping. > Paul > -------------- Original message ---------------------- > From: graywolf <[EMAIL PROTECTED]> > >> The point everyone seems to be missing is that this is only a 2x upsize at >> the >> most. No need for a lot of exotic stuff. And I have not noticed that GF or >> Stepping does all that much better than Bicubic Smoother. Converting from >> RAW is >> a bit better, but not miraculously so. While I do not print 16x20's I do >> often >> crop that much. This is not rocket science, for crying out loud. >> >> graywolf >> http://www.graywolfphoto.com >> http://webpages.charter.net/graywolf >> "Idiot Proof" <==> "Expert Proof" >> ----------------------------------- >> >> >> P. J. Alling wrote: >> >>> I think it would depend on three things. 1.) Subject matter, a very >>> detailed photo will loose a lot upresed that much, while a less detailed >>> shot might be fine. 2,) Viewing distance. If viewed from a reasonable >>> distance it will look fine. Close up flaws will be very apparent. 3.) >>> The method used to upres the shot. Genuine Fractals is supposed to work >>> miracles, stepwise bicubic interpolation is supposed to work almost as >>> well, (and is available to anyone willing to make a Photoshop action). >>> You could try resizing using the second method to get a reasonable pixel >>> density for your purposes then crop out a sample size and print it to >>> see if it would work. >>> >>> David J Brooks wrote: >>> >>>> I can't seem to fiqure out the math on this and don't want to quess, >>>> but can anyone tell me what size i need to uprez a 2000 x 1300 file to >>>> print 16x20. >>>> >>>> If a 2.74 D1H file can be resized that big. >>>> >>>> A client wants this size for her company wall. >>>> >>>> Dave >>>> >>>> >>>> >>> >> -- >> PDML Pentax-Discuss Mail List >> [email protected] >> http://pdml.net/mailman/listinfo/pdml_pdml.net >> > > > -- All dogs have four legs; my cat has four legs. Therefore, my cat is a dog. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
