Re: colorsync-users Digest, Vol 16, Issue 5
Re: colorsync-users Digest, Vol 16, Issue 5
- Subject: Re: colorsync-users Digest, Vol 16, Issue 5
- From: Louis Dina <email@hidden>
- Date: Tue, 05 Mar 2019 14:15:27 -0600
Peter Miles and Peter Nagy,
Thanks, you both confirmed what Refik (thank you) shared and what I have
just learned. This was always a bit of a muddle to me, but finally it is
clear. I've been using 5600-5800K monitor WP for years with great soft
proofing success, and now I know why it works so well, and why 6500K
doesn't.
Mystery solved! Thanks everyone.
Lou
> Message: 3
> Date: Tue, 05 Mar 2019 04:26:58 +0000
> From: "Miles, Peter" <email@hidden>
> To: "email@hidden"
> <email@hidden>
> Subject: Re: Monitor White Point Confusion
> Message-ID: <email@hidden>
> Content-Type: text/plain; charset=utf-8
>
>
> Hi Lou.
> I can confirm what Refik is saying from having made on-screen
> measurements• using an i1pro and Spectrashop a few years back.
>
>
> Regards
> Peter Miles
>
>
> *A few years back I wanted to clarify in my mind the same question Lou
> asked.
> So I measured the on-screen colour of a soft proof in photoshop when the
> 'simulate paper color’ was on. I compared that to measurements I made of
> the display white point. I did this on a profiled Eizo at a 3 different
> white point settings .
>
> From the measurements it was clear that the on-screen colour of the
> soft-proof (with ‘Simulate Paper Color’ on) was different for each display
> white point used.
> And from comparing the ab plots in Spectrashop it was also clear that the
> on-screen colour of the soft-proof (with ‘Simulate Paper Color' on) was
> being shifted ‘relative' to the white point of the display.
>
> ------------------------------
>
> Message: 4
> Date: Tue, 05 Mar 2019 08:46:00 +0100
> From: Nagy Péter <email@hidden>
> To: email@hidden
> Subject: Re: Monitor White Point Confusion
> Message-ID: <email@hidden>
> Content-Type: text/plain; charset=utf-8
>
> Hi Lou,
>
> What you would like to do is IMHO possible in theory, but you have to take
> into account the capabilities of the math model and the devices you use. If
> you try to mimic the actual printed piece on your screen (meaning you
> switch to soft-proof mode in Photoshop) you’re working in the 8-bit realm
> of the current graphics software and device drivers. If you’re far away
> from the target (eg. on a screen calibrated to a white point of 6500K) the
> color management engine has to perform a large correction to achieve the
> desired result. Measurement and profiling errors add up, and the color you
> see on screen will not be perfect.
>
> On the other hand, your original approach (calibrating to 5700-5800) is
> almost perfect, as that’s the ‘perceived’ white point of today’s
> OBA-stuffed coated papers under 5000K lighting. In this case, the color
> management engine performs a relatively small conversion on the white
> point, so the errors will be smaller or negligible.
>
> Until we don’t have 10 or more bit ‘deep’ device drivers and monitors (and
> work with 16 bit images in Photoshop), the best you can do is to calibrate
> to the closest perceived white. Another consideration might be to employ
> displays which are more conservative on the contrast; we don’t need 1:10000
> for soft proofing.
>
> Kind regards,
>
> Peter Nagy
>
> ------------------------------
>
> **********************************************
>
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