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The reason you should always coat aqueous-printed canvas is that all aqueous media receive ink into a "receptor coat" that is bonded to the surface of the media. The receptor coat has to be there in order to 'receive' the aqueous ink. The inclusion of the receptor coat is also why aqueous media...

Just a little wry observation there. Don't mind me. Mike

Alois, Well, first off, no. I'm not talking about "color correction" per se, or color correction for any ink hue errors. One key principle of color management is that there aren't any specific defined values for any primary colors, including CMY and K. ISO standards notwithstanding, the fact...

*Dryly* Thanks. It'll probably get here along with the check from Adobe. Seriously, the way it's supposed to work is that you decide from all my keen insights to hire me; and I'll wager if you had, you'd have actually spent less money in the end if you had than by following the breadcrumb...

I don't know. It's merely an observation. Mike

Gordo, So am I. Or at least this US citizen in particular. As I said, I've had more than my share of health issues. I unfortunately know several doctors on a first-name basis; and while, yes, a combination of forces has made healthcare billing and pricing a bit of a nightmare these days, I'll...

In the US, the answer is the difference between health insurance and car insurance. Car insurance companies can compete across the US and across state lines; they compete on the basis of cost and on the basis of service. And they advertise constantly for customers. I myself use the car insurance...

Well then... All L values are tone values. Not all tone values are L values. L values are values corresponding to a specific color space (some variant of L*a*b*.) Tone values in a single pixel of an image do not do this. A 100% pixel in the magenta printer of an image does not correspond to...

Gordo, In large-format inkjet printing these days, some marketing genius somewhere -- I'm not sure who's to blame, all the manufacturers have adopted the term -- has decided to call multiple-dot-size printing capability as "greyscale." I rail against this, since it co-opts a term that already...

Erik, Sorry, but it sounds to me like you're a fine engineer, but that your knowledge of image reproduction may be a little spotty. It is at least conceivable to combine image creation spaces and image working spaces into one "vision space" such as XYZ or L*a*b*. It is not possible to extend...

Gordo, Well the way I'd describe it: Individual CMYK channels have no L*a*b* information in them at all. Because they're not L*a*b*; they're CMYK. If you have a CMYK image that is, let's say, a solid color that is C=40 M=30 Y=20 K=10, then the individual pixels in each channel would be 40...

Erik, To me, the thing is that that's one of those things that sounds ideal in theory, but... The way I describe it in seminars and the like: Every image in our industry goes through three color space phases: Creation space; working space; destination space. The trick to color management is...

Erik, Interesting. All I can say in response is that I didn't invent any of this. I just use it. And I'm not a physicist so I won't attempt to argue any points of that. What I will say though is that color management is what I do for a living, and it does work. Obviously you're right there...

What you're describing only works if you disable color management altogether. In that case, then yes, L*a*b* is not involved. L*a*b* (or in some cases XYZ) is what makes color management work. If -- if -- you are not using color management at all and create files in CMYK, then they would pass...

What's amiss is that in actuality there are no "greyscale" images involved. Digital images are groups of pixels -- picture elements -- period. That is how they are defined. If you want to think of each channel as an individual greyscale image that's your business, but it's not. Each channel is...

Sure. The clarification is that that isn't the way it works. What a RIP does is convert pixels -- the smallest unit of complete color information in a digital image -- into dots -- the smallest unit of individual colorant in a printed image. Individually, digitally, pixels are groups of...

So... I'd interject a word of caution here. The way any RIP works is that in the end it generates a tif which it then converts into the final print file. It only treats spot colors and images differently in that for a spot color vector, it disregards the original creation color space of the...

Just to note that when I say large-format, I mean inkjet. Toner is another story. I agree completely. Mike

Note that while the Epson has more colors, its primaries are CMYKOGV. The other colors are all lights and do not increase gamut. Any gamut increases from the Epson to the Indigo would basically be profile-related in some form or fashion. Exactly. Of course, that's true of CMYK just as much as...

If you dig a little deeper, what you'll find is that all 'resolutions' using this type of designation are what is known as "contone" settings. And what that means is that basically all the information about how and what the printer is doing as it's creating dots is not available to the RIP...