On Mon, Feb 8, 2010 at 5:23 PM, Larry Colen <[email protected]> wrote: > I am going to try getting some shots printed at the local costco at 12x18. > I've learned just enough to think I'd want to tune Lightroom's export to > their printer, but don't know what that would be. > > What settings should I tell lightroom on export? > > 360 or 1440 dpi?
My experience with Epson printers is that I can get excellent results with as low as ~180 ppi for large prints, and that resolution improvement stops at 360 ppi. Other printers ... may be different. Size the file such that the output sizing you want falls between 180 and 360 ppi, if you want to fix a resolution. 300 ppi is a good target, but if it falls within this range without resampling, I'd just hand them a full resolution file and let them do the sizing for you. Some pixel resolution - sizing approximations for 12x18 inch images: 180 ppi :: 2160 x 3240 pixels, 7 Mpixels 200 ppi :: 2400 x 3600 pixels, 8.6 Mpixels 240 ppi :: 2880 x 4320 pixels, 12.4 Mpixels 300 ppi :: 3600 x 5400 pixels, 19.4 Mpixels 360 ppi :: 4320 x 6480 pixels, 28.0 Mpixels Pentax *ist DS outputs 2000x3000 pixels :: 167 ppi unscaled Pentax K10D outputs 2592x3872 pixels :: 215 ppi unscaled Pentax K20D outputs 3104x4672 pixels :: 260 ppi unscaled Pentax K-x outputs 2848x4288 pixels :: 238 ppi unscaled > proRGB or sRGB? Either sRGB or a supplied device specific profile. I'd do a test of printing one of each first. Many of these kinds of places ignore profiles entirely, at which point sRGB is better. (You would never want to profile an 8bit image file with ProPhoto RGB anyway... not enough bits! ProPhoto RGB requires 16...@component.) > jpeg quality 100? Yes. -- Godfrey godfreydigiorgi.posterous.com -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
