I was up on some popular UK web site dealing with monitors galore (tftcentral) and I stumbled on this comment, which made me pause : "An X-rite i1 Display Pro colorimeter was also used to verify the black point and contrast ratio since the i1 Pro 2 spectrophotometer is less reliable at the darker end.". Does this make any sense to anyone, here? I'm into metrology over my ears, these days. So I'm especially sensitive to comments like that. / Roger
Hi Roger, I will not comment on the two mentioned instruments. But in general it is true that a colorimeter has advantages over a spectrometer when very low signals need to be measured. Reasons are e.g. a) sensitivity: the spectro divides the few photons into 30+ bands, the colorimeter into 3-7 b) noise: a contact measurement warms up the instrument which creates noise which makes the readings of very low signals less reliable Does this make sense to you? Of course there are spectrometers available which do not suffer from the disadvantages as actions have been taken to overcome them. Best regards Claas
Am 09.12.2019 um 13:33 schrieb Roger Breton via colorsync-users <colorsync-users@lists.apple.com>:
I was up on some popular UK web site dealing with monitors galore (tftcentral) and I stumbled on this comment, which made me pause : "An X-rite i1 Display Pro colorimeter was also used to verify the black point and contrast ratio since the i1 Pro 2 spectrophotometer is less reliable at the darker end.". Does this make any sense to anyone, here?
I'm into metrology over my ears, these days. So I'm especially sensitive to comments like that.
/ Roger
_______________________________________________ Do not post admin requests to the list. They will be ignored. colorsync-users mailing list (colorsync-users@lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/colorsync-users/lists%40bickeboeller...
This email sent to lists@bickeboeller.name
“An X-rite i1 Display Pro colorimeter was also used to verify the black point and contrast ratio since the i1 Pro 2 spectrophotometer is less reliable at the darker end.". Does this make any sense to anyone, here?
That doesn’t make sense to me. The two devices may not correlate but you can’t verify one with the other. That’s comparing a fairly new colorimeter to a pretty old spectro… Of course there’s also the software that manages the data from these devices… Let’s not get stuck in theory, let’s instead keep this real world. IMO, a far better question is “Which device delivers superior display calibration across a variety of devices?” My experience with i1Profiler with these two devices suggests that the spectro is the better device when calibrating a variety of displays. Neither device delivers a calibration with better shadow detail and constancy across a variety of display types is clearly better with the spectro. Scott Martin www.on-sight.com Precise color science for printmaking professionals
Attempt to sort out the lingo: 1) Radiometer is a sort of light meter for some assumed spectrum;could be any EMR. If it is used for photography it's literally called a lightmeter. 2) Spectrometer, a radiometer that can report spectral power distributions, e.g., the EMR contour of a spectra. This is classically about a prism,hot objects and the visible signatures of their elemental constituents. But also could be about any range of EMR 3) Spectroradiometer, measurement of precise energy distributions across a spectra. This is about knowing not only the spectral distribution, but exactly how much power is being conveyed. 4) Spectrophotometer, is an application of a spectrometer for evaluating SPDs in range of visual sensation. In domain of Colorsync Users, this tends to be optimized for reflective media, but such a distinction is application dependent. 5) Colorimeter, a device that reports tri-stimulus colorimetric (e.g, CIE XYZ) coordinates of spectra; optimized under an assumption of RGB emissive media, e.g., display techbology These last two are applications to colorimetry, whereas the former three apply to many other EMR domains. So if your a physicist or chemist or radio engineer, etc. you are thinking in terms of first 3, and if you are a color engineer you are thinking in terms of the last two. As to the sensitivities, this is a highly application-specific aspect of a particular device. According to the writeups I found, there's no inherent property of a colorimeter vs spectrophotometer sensitivity advantage. In context of TFTCentral they are talking about specific XRite instruments which may well have the claimed distinction. So to me it seems there's no contradiction of the TFTCentral observation. /wire On Mon, Dec 9, 2019 at 4:34 AM Roger Breton via colorsync-users < colorsync-users@lists.apple.com> wrote:
I was up on some popular UK web site dealing with monitors galore (tftcentral) and I stumbled on this comment, which made me pause : "An X-rite i1 Display Pro colorimeter was also used to verify the black point and contrast ratio since the i1 Pro 2 spectrophotometer is less reliable at the darker end.". Does this make any sense to anyone, here?
I'm into metrology over my ears, these days. So I'm especially sensitive to comments like that.
/ Roger
_______________________________________________ Do not post admin requests to the list. They will be ignored. colorsync-users mailing list (colorsync-users@lists.apple.com) Help/Unsubscribe/Update your Subscription:
https://lists.apple.com/mailman/options/colorsync-users/wire%40lexiphanicism...
This email sent to wire@lexiphanicism.com
participants (4)
-
Claas Bickeböller
-
graxx＠videotron.ca
-
Scott Martin
-
Wire ~