Then I take this to mean that there is a conversion from CMYK to RGB, but not one from RGB to CMYK. But if we suppose now, seperately, that the conversion from CMYK to RGB is not reversible. I take this to mean that there exist a conversion from RGB to CMYK, and from CMYK to RGB. Suppose that the conversion from RGB to CMYK is reversible. Notinasnaid 13:07, 9 September 2005 (UTC) Reply Still doesn't make sense This is why I think color swatches (except RGB swatches designed to show your own monitor's behaviour) have any places in an online resource that has pretensions to accuracy. Would the entry for sparrow allow a picture that was sometimes a cormorant? I don't think so. But it is misleading, just like the formula for conversion which I would also like to see removed, because it reinforces wrong ideas. I feel that would be a better graphic - it at least looks something like some real world colors. ![]() In the second picture, the cyan seems to have only a little white, the magenta only a little cyan, and the yellow is very pure. And when I printed this new graphic they were duller still, a result of continuing gamut compression which means that they never can match with these printer settings.Įxamining with a loupe I can see that in the first printout, the cyan contains white and magenta dots, the magenta has white and cyan dots and the yellow has white and cyan dots. The colors were certainly duller than that. They were rather more like but of course that was created with the wrong CMYK profile: SWOP Coated rather than a profile for the Epson inks. The result was nothing like the strong primaries in the original graphic. I did your test, printing on an Epson 880 with Epson inks and default Windows 2000 driver settings. I assure you that the C, M, Y, and K inks used by those printers pretty-accurately match the color swatches inthis article as displayed on my various CRT and LCD displays.) Atlant 12:00, 9 September 2005 (UTC) Reply (By the way, you're dodging the suggestion I made about printing the page using an inkjet printer. But don't remove something that is technically accurate just because you don't like it. As I said, if you don't like those color swatches, find a photo of gobs of ink that pleases you, and add that to the article. Unfortunately, 99.999% of the time, this article will be viewed on a device that uses additive color, and you're just going to have to live with that. Should this article be about real CMYK or an idealised and nonexistent version of it? Notinasnaid 21:59, 8 September 2005 (UTC) Reply No, you're correct: this article isn't about additive color. This picture can only mislead and confuse people in an area where there is already substantial confusion about what these colors really look like. That's why CMYK has a significantly different gamut to RGB. Both the cyan and magenta in CMYK are significantly darker, but vary depending on the ink mix. But I have never seen a cyan/magenta ink for use in CMYK that was anything like that. ![]() Certainly, additive cyan/magenta look like the picture. Atlant 14:06, 8 September 2005 (UTC) Reply What do you think they look like (when displayed on an additive color device)? Or maybe you should print the Wiki page and see if your color printer shoots anything other than cyan ink for the cyan swatch and magenta ink for the magenta swatch it ought to be pretty easy to tell, even without a magnifying lens. Notinasnaid 17:23, 7 September 2005 (UTC) Reply Funny, when displayed on an additive-color device, I was pretty sure that cyan was 100% green + 100% blue and magenta was 100% red and 100% blue. Well, that isn't what cyan and magenta look like. Atlant 12:34, 7 September 2005 (UTC) Reply Of course, you should feel free to add another picture (of 55-gallon drums of ink or what-have-you). ![]() While everyone knows what "Yellow" is, many people don't know what "Magenta" is and nearly everyone has no idea what "Cyan" is. Notinasnaid 11:21, 5 September 2005 (UTC) Reply Don't do that. In general, I don't think any reference colors belong in wikipedia. I propose not replacing it because there is a wide variation in printing inks, and even if there wasn't, there is a wide variety in monitors. It contains pure RGB cyan, magenta and yellow, which look very little like printing inks.
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