Oh common read it.. back PAGE
So how would evaluate the difference between a printed page and three different proofs ?
The data isn't 'fictional' it's the data I've just measured. Have you ever actually done anything like this with a Blurb book ? if so, post your numbers.
Here's what I've done: I spent 4 years with my partner, spending literally hundreds of hours, at multiple locations all over this planet, in shops for one customer (a Fortune 50) setting up Indigo's Nexpress and Xeicon digital presses for color managed output of books like Blurb would love to be able to produce, along with setting up process control procedures to ensure the color from all plants is within a very small dE agreed upon by this big company. That's my day job.
What's yours? I don't need to measure anything to see how
far off Blurb's process control is; I've printed the identical book over the course of time and I don't need a Spectrophotometer to see how the output differs from Blurb. So not only like you, do they not have a solution for soft proofing their products, they can't even keep their devices consistent enough to match output over the course of a few months. Another reason why soft proofing to their product, even if they did provide the actual output profile, (which they do not and which you cannot seem to wrap your head around), is pointless. It's a moving target and I'm not the only one here who's seen this result!
You don't have the CMYK profile for their process.
You can't control what Rendering Intent they use (begging the question, which to use for soft proofing if they even could keep their process in-line and supply a profile to reflect this).
You can't send sRGB or soft proof sRGB to a digital press; it's
pointless. Open up any ICC profile to soft proof, you'll end up with the same incorrect rendering of what you'll get.
You don't understand the fundamentals of soft proofing; use the actual profile and RI to soft proof and then convert.
You are wasting my time with you lack of acceptance of the points above. And I don't expect you ever will but your audience has data and an opinion from someone who's spent far, far more time color managing digital presses (and probably everything else) than you sir.
Assuming your day job (undefined) isn't say a doctor, do you find your time is well spent at his/her office
arguing with them about the subject of medicine you have little if any training in? I suspect you probably do. Again, for your readers, an important consideration when trying to evaluate who's advise to listen to:
The reason there's so much ignorance on the subject of color management, is that those who have it are so eager to regularly share it! - The Digital Dog