Calibrating monitor for Blurb (doubts on parameters)

[adrjork]

Hi everyone,
I’d need to properly calibrate my monitor in order to prepare a magazine for Blurb print. Blurb won’t give me any suggestion ablut parameters, but around in the web I’ve found “D50, gamma 2.2, 80dc/m2”.
So, in DisplayCAL I set Photo D50 (that has gamma 2.2) and I set WhiteLevel at 80cd/m2. The result in that now my monitor is very yellowish… Is that normal?
Anyone know if those parameters are right for Blurb?
Please, let me know.
Thanks in advance.

[Vincent]

That setting is for matching printed copy. As a general rule:

-whitepoint = color coordinates of light that goes on paper, usually D50 lamps with proper spectral distribution (“5000K” is NOT enough)

-montor brigtness  = lux on paper divided by pi. If you choose 80 on monitor it’s about 250lux on paper placement which may be too dim. Higher values provide better dark/black colors inspection on printed area. For example some ISO norm P2 appraisal is 500lux on paper with D50 lamp=> 160cd/m2 in monitor.

Choose whatever you want as long as you understand this kind of correlation =>
-paper will reflect “light color” (display white=light source white) + its own color (Photoshop = simulate paper white)
-paper will refect (as an “ideal” diffuse reflexion) a portion of incoming light. Divide by pi as a 1st guess (lambert law etc, google it for details)

Change light on paper <=> change monitor settigs.

For example some good 5600K violet led+rgb phosphor from Yuji LED with a good spectral power distribution and 320lux on paper placement => as “first guess” 5600K daylight curve as whitepoint on display and 100cdm2

When printing on a lab ask for its recomended setup and try to get a light source for evaluating printed work equal to that conditions (relations above).

• This reply was modified 3 years, 2 months ago by Vincent.

[Vincent]

PS: also as a REQUIREMENT you should have a device that can properly measure your display and have it configured it as it should.
For example colorimeter + colorimeter corrections. Explained on too many threads, search here.

[adrjork]

Thanks a lot Vincent! Yes, I’m using Xrite i1 Display Pro as a probe for DisplayCAL.
Your explanation is clear.
I don’t know, surely it’s my bad, but it’s so weird to me working with D50 calibrated monitor… It’s all so yellowish…

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[Vincent]

Thanks a lot Vincent! Yes, I’m using Xrite i1 Display Pro as a probe for DisplayCAL.

With the proper correction for yur backlight type

Your explanation is clear.
I don’t know, surely it’s my bad, but it’s so weird to me working with D50 calibrated monitor… It’s all so yellowish…

It is more yellow. D65 is b=-20 from there. Usually at higher brightness on an uniform screen it won’t look that bad, but this needs higher lux value for print comparison.

Also remember to use softproof with your lab printer profiles. Simulating paper white , typical OBA RC glossy paper simulation will look bluer on screen.

[Author]

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