Re: Two monitors, side by side
Re: Two monitors, side by side
- Subject: Re: Two monitors, side by side
- From: edmund ronald via colorsync-users <email@hidden>
- Date: Sat, 8 Feb 2020 12:16:35 +0100
A long time ago I had a Samsung T something and a CG210 - the latter which
I still own.
I used Basicolor Display to measure the CT of one and used that as a basis
for the calibration of the other.
I know it shouldn't have worked, but it worked quite well, both monitors
were perfectly usable for photo retouch. .
I displayed Colorcheckers on both when doing the setup, and had a young
lady help me and we agreed we had quite a good match.
I still occasionally use the CG210 and don't consider it obsolete.
Edmund
On Sat, Feb 8, 2020 at 6:35 AM Refik Telhan via colorsync-users <
email@hidden> wrote:
> Hi Roger,
>
>
>
> Just measure the spectral response of these two monitors that you have set
> to be at the same chromaticity and luminance, you will see that the Blue,
> Green and Red band-pass filters used in their panels are very different in
> terms of width and position on the wavelength axis.
>
>
>
> In a study I made few years back, I have tested two physically identical
> desktop viewers equipped with fresh 60 cm T8 tubes from two different
> manufacturers and two displays. And have tried to get the two displays to
> match each other as well as an unprinted FOGRA39-certifed proofing stock
> placed in the desktop viewers. To get them visually close to each other and
> to the real samples, I had to set them to different white points. I have to
> point out that the fresh T8 tubes from the two manufacturers that were
> advertised to be ISO 3664:2009 compliant, gave visibly/considerably
> different results. Getting things aligned has not been easy or complete.
> And things got even harder when I called in other people to find their best
> match.
>
>
>
> When I tried to test the visual match with a total of 6 people, they all
> disagreed. I have then let each of them to find their best match by
> calibrating/profiling each monitor to a different white point; all came up
> with different results. But there was a marked difference between the two
> monitors. While people set Monitor A to quite different white points to
> achieve their best match, the white point picked for Monitor B have been
> very close to each other. While Monitor A had a pinkish cast at all of the
> white point settings, Monitor B had a neutral white appearance.
>
>
>
> Below are the spectral power distribution curves for the two monitors.
> Their white points were both set to 5400ºK during calibration/profiling
> process.
>
>
>
> Monitor A
>
> https://www.dropbox.com/s/51p73dmypuuetcu/Monitor A 5400K.png?dl=0
>
>
>
> Monitor B
>
> https://www.dropbox.com/s/2ng8bmp576k3xg7/Monitor B 5400K.png?dl=0
>
>
>
> When you have narrow-non-overlapping RGB filters (and when the Red filters
> is closer to the right end of the visible spectrum) the disagreement
> between the observers grow. Monitor B, with its wide-overlapping filters,
> is behaving like a light box on which you can view transparencies.
>
>
>
> As I have made the measurements in “Ambient” mode in a dark room from a
> distance of about 30 cm, you will also see the CRI values, (as well as the
> slightly shifted CCTs):
>
>
>
> Monitor A - CRI: 37
>
> Monitor B - CRI: 93
>
>
>
> I have made similar measurements on displays from different manufacturers.
> They all have quite different SPD curves. The narrower the band pass
> filters, the greater becomes the disagreement between the observers. If the
> Red filter peaks at somewhere around 650 nm, what most people observe is a
> pinkish cast in the white point and light grays.
>
>
>
> Most monitor profiling software packages also have a built-in verify
> module. Most of those which can do CMYK simulation, do it “relative to
> display profile white point” and the verifier says OK, even if you
> calibrate/profile your monitor to a range of CCTs, say between 5200 to
> 5800ºK. Florian Hoech’s DisplayCAL 3 lets you to switch this off. You can
> then see where your monitor is actually sitting.
>
>
>
> https://www.dropbox.com/s/kbaeij6z1w73578/DisplayCAL 3 Verify.png?dl=0
>
>
>
> Apparently, in the world of soft-proofing/monitor proofing everything
> seems to be “relative”.
>
>
>
> Best regards,
>
>
>
> Refik Telhan
>
> Light and Color Management Consultancy
>
>
>
> --------------------------------
>
>
>
> On 05.02.2020 20:21, "colorsync-users on behalf of Roger Breton via
> colorsync-users" <colorsync-users-bounces+rtelhan=
> email@hidden on behalf of email@hidden>
> wrote:
>
>
>
> I managed to pull my old CG-21 of the moth balls, to serve as a second
>
> display - how could have I ever lived without this convenience? Crazy.
>
>
>
>
>
>
>
> Of course, first thing I did was to try to make it "look" like my NEC
>
> PA271W. They're both LCD monitors yet, at the same chromaticity and
>
> Luminance, they don't look the "same". One is "reddish" (CG-21) while
> the
>
> other (NEC) is "greenish".
>
>
>
>
>
>
>
> Any suggestions?
>
>
>
>
>
>
>
> / Roger
>
>
>
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