Archived posting to the Leica Users Group, 2007/08/21
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 11:38 PM 8/20/2007, you wrote: >Don, his monitor won't show that colour space though, and that's >where the printing decisions are made. Only the very best of the >Eizo's will show 96% of Adobe RGB. I'm surprised regarding the >printer substantially showing that colour space though???? If you're >making editing decisions in ProPhoto RGB you risk significant >remapping, surely? >My 3800 and 800 both custom profiled and soft-proof beautifully, but >certainly won't reproduce the very high end blues. This is less >apparent with greens for me. I'd be very interested if you have some >references for that Epson colour space capability. > >Worthy of a thread, I think. > >Cheers >Hoppy Hoppy - I agree, it's worthy of a thread - and several books! It's my understanding that the input devices - cameras and scanners - can capture more colors than can be displayed or printed by the output devices - monitors and printers. It's probably a good idea to use the widest color space you can, in this case, ProPhoto RGB, as long as you know that some colors will be out of gamut and can determine which rendering intent is the best one to use to specify which colors will replace the ones that are out of gamut. Bruce Fraser recommends using relative colorimetric most of the time since it preserves more of the original colors. Relative colorimetric matches the white of the source to the white of the destination since our eyes adapt the other colors to the way we see white. It keeps the in gamut colors the same and clips the out of gamut colors. Perceptual changes all of the colors so the relationship of the colors to each other remain the same but all colors fit into the gamut. When you get into very saturated or vivid colors the rendering intent can make a big difference. I started researching color management when I ran into problems with this photo: http://www.pbase.com/tinamanley/image/69780688 The color of the cosmos is totally out of gamut. To my eyes, it prints best with relative colorimetric but the print doesn't begin to match the colors that I see on the monitor. My monitor is an Eizo profiled with Gretag Macbeth. I'm printing on an Epson 4800 using ImagePrint profiles. There is nothing wrong with the color of the print - it probably is a closer match to what the flower actually looked like. (Maybe this is a Leica M8 magenta issue ;-)) Relative colorimetric replaces the out of gamut reddish purple with a bluish purple. I've tried using other color spaces and did work for awhile with just Adobe RGB but ProPhoto RGB does include more colors that can be seen on the monitor and printed than Adobe RGB does. As long as you know that it also contains colors that can't be seen or printed and choose the rendering intent that will give you the closest results, it's probably the best space to use for everything except the web. Bruce Fraser says that Adobe Camera Raw uses ProPhoto RGB to do its processing. I'm only about half-way through his Real World Color Management book but I've used it as a reference book to answer a lot of my color mangement questions. Tina Tina Manley ASMP, NPPA, EP, PI http://www.tinamanley.com