- From: Chris Lilley <Chris.Lilley@sophia.inria.fr>
- Date: Mon, 1 Dec 1997 22:09:30 +0100 (MET)
- To: Space Cowboy <spacecow@mis.net>, Chris Lilley <Chris.Lilley@sophia.inria.fr>
- Cc: www-style@w3.org
On Dec 1, 4:01pm, Space Cowboy wrote: > Chris Lilley wrote: > > whose screen? Do you have the same make of monitor I do? > > Both of our monitors are constrained by the limitations of CRTs (of course, Neil > was right, I didn't think of plasma or LCD screens that can display more > colors). At the least, you can display from 0-255 red [...] Those aren't colors. You can't measure them, in the absence of a particular monitor. And my monitor, given a particular set of drive voltages, will display a different color from yours with the same input. > and I'm not going to try to fix your gamma and color curve for you. That's > something we are always going to have to deal with. CSS1 already deals with it. > > Certainly CSS is good for screen layout, and certainly CSS2 adds some > > features that are needed for printing. Go look at the CSS2 spec, the ack > > That's a conversion. It's not a straight line either way. Pardon? > > Not at all. Adding colors that some screens can display while others > > can't is fine, particularly if your monitor has a wider gamut than the > > next guys. And, it isn't a screen standard. If a company logo happens > > to contain colors that can't be represented on a particular screen, it > > still makes sense to be able to say what the color should be - and you > > may get a closer match when you print. > > I stand corrected. I guess we should go all out and do the L*A*B if where trying > to get the color match, eh? No, sRGB as currently specified will do just as well and can be unambiguously converted to LAB if required. > > You do *not* want to have CMYK specifications in stylesheets, unless your > > stylesheet is targetted at a particular make and model of printer with a > > particular ink set printing on a particular weight and finish of paper. > > That's still a chance you have to take. I could have a dusty, ten-year-old > monitor with a C:\> burnt into the top-left corner, and a 3-shade gamut. Yes you could. > It's the same parable. No, not at all. Conversion from one RGB space to another is fairly simple, to a reasonable degree of accuracy. Conversion of one CMYK separation to another is real hard and printers vary a whole heap more than monitors do. > Of course, printers are notorious about that, but I think that > most drivers try to compesate now Uh ... no. Not really. Conversion to CMYK from an additive color space is still non trivial (check how long any real-world color separation program takes to do a single image). Conversion from CMYK to CMYK is definitely not something that a driver is going to do. -- Chris Lilley, W3C [ http://www.w3.org/ ] Graphics and Fonts Guy The World Wide Web Consortium http://www.w3.org/people/chris/ INRIA, Projet W3C chris@w3.org 2004 Rt des Lucioles / BP 93 +33 (0)4 93 65 79 87 06902 Sophia Antipolis Cedex, France
Received on Monday, 1 December 1997 16:09:51 UTC