Good article - never obsolete. Thanks Mr. Rodney. There's a point, on page 3, in the middle of the first paragraph, where he writes: "If the sample is dark we may need to spend an entire second on each step to get an accurate reading. That's over 5 min to take one measurement!". That's indeed a long time. I recently got my hands on a good instrument and I'm finding - the hard way - how long it can take to measure down to RGB = 0,0,0. I'm still not clear on the creation of "XYZ filters", though? . / Roger From: Andrew Rodney <andrew@digitaldog.net> Sent: December 9, 2019 10:56 AM To: <graxx@videotron.ca> <graxx@videotron.ca> Subject: Re: i1Pro and monitors Yes, see: http://lumita.com/site_media/work/whitepapers/files/xrite-wp-3a.pdf Andrew Rodney http://www.digitaldog.net/ On Dec 9, 2019, at 5:33 AM, Roger Breton via colorsync-users <colorsync-users@lists.apple.com <mailto: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.