On Tue, Feb 9, 2010 at 8:41 PM, Ken Waller <kwal...@peoplepc.com> wrote: >>> Is there any advantage to using sRGB over RGB or vice versa for printing, >>> either at home or at a Costco type process? >> >> What do you mean by "RGB"? (Just about everything you work on in >> Photoshop is in RGB.) If you mean "a non-color-managed image" (in RGB >> but without any color profile at all), then there certainly is a big >> advantage: If an image isn't in any known color space then >> reproduction can be all over the map. > > I'm referring to the color space Adobe 'RGB' vs sRGB as available as a > capture option in digital SLRs. > It covers a wider area than sRGB.
Ken, "Adobe RGB (1998)" ... something different from "Generic RGB" or all the other flavors of RGB ... is a color space with a gamut originally optimized to allow satisfactory *editing* for a CMYK web press. The vast majority of photographic printers in the world have a device color space significantly smaller than sRGB, there is no downside at all to supplying images to a print service fitted to the device neutral sRGB colorspace. The only advantage to converting an image into Adobe RGB color space is for better editing flexibility in this context ... and it's nowhere near the flexibility that comes from editing in ProPhoto RGB in a 16...@component working space, which was designed for the much larger colorspace capabilities of a digital sensor ... but the end product of editing in either case has to be fitted down into something which often makes sRGB look like a broad and flexible colorspace. The only substantively better output colorspace to prepare an image with, other than the device-neutral sRGB, is a device-dependent color profile for a particular machine/ink/paper combination *presuming* that a) the people running the machine have actually profiled it properly and b) they actually operate the equipment properly. In most cases, as Will Robb said up thread, they are more accustomed to printing from an sRGB profiled master and do a better job. -- Godfrey godfreydigiorgi.posterous.com -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
