Hello Refik, The graphs in the ASUS report linked by Roger Breton correspond to Sections 4.2.2 and 4.2.3 of ISO 12646:2015. The titles of these sections�in the standard are confusing but the computation is clear: Titles of report: 4.2.2 Evaluation of tone uniformity 4.2.3 Tonality Evaluation (Uniformity) are really described as being: 4.2.2 Color Uniformity (DeltaE00 from center patch) 4.2.3 Tone uniformity (Mid grey(127)/White(255) ratio�deviation from center patch) This is what is shown in the ASUS report and in BabelColor CT&A ISO 3664+ tool Note: CT&A ISO 3664+ tool combines many standards and various versions of these standards, of which ISO 12646 had many between the 2008 version and the latest 2014-2015 version. HOWEVER, the Tone uniformity should NOT be done at three grey levels. It is defined only for the Mid grey(127)/White(255) ratio. This is what is done in CT&A and in the middle-left graph of the ASUS report. You will note that the top-left graph of the ASUS report does what looks like a White(255)/White(255) ratio which is always equal to one (1) and the DEVIATION is ZERO for all positions. This is redundant and useless. The data in the bottom left graph looks like it is based on a Dark grey(63)/White(255). This is not fundamentally wrong but it is not specifically required in the standard. � Danny Pascale dpascale@babelcolor.com www.babelcolor.com On Wed, 12 Feb 2020 12:25:19 +0300, Refik Telhan via colorsync-users <colorsync-users@lists.apple.com> wrote: Hi Roger, I have seen measurements of uniformity in done in a variety of ways on different reports. Below are the factory reports of two BenQ monitors: https://reflight-my.sharepoint.com/:i:/g/personal/rtelhan_reflight_onmicroso... https://reflight-my.sharepoint.com/:i:/g/personal/rtelhan_reflight_onmicroso... The ASUS report is not specifiying the type of the uniformity measure. BabelColor’s ISO 3664 Test Report for Color Monitor reports a “Tone Uniformity” calculated as the percentage deviation from the center point’s Gray/White ratio. This is all too confusing. Another source of confusion is the reliability of these reports. I have tried to replicate at least some of the mesurements in the above reports. They were off the target considerably. These reports should be more specific about what they measuring. Best, Refik On 12.02.2020 04:23, "colorsync-users on behalf of Roger Breton via colorsync-users" wrote: ��� The world of high end monitors is changing? ��� I stumbled on this "Color Calibration Report" from some Taiwanese ��� manufacturer: ��� https://1drv.ms/b/s!AkD78CVR1NBqkt8MK5418QlCEBbkHA?e=tAYocf ��� I'm shocked by the data shown in Page 2, especially the brightness ��� uniformity; it's all "0.000", at every 25 positions? And the Color ��� Uniformity barely crosses over the 1 DeltaE mark. Are today's monitors that ��� good? For a relatively low price, I mean, under $1,000 USD, compared to the ��� more "respected brands"? ��� / Roger ��� ����-----Original Message----- ��� From: Andrew Rodney ����Sent: Tuesday, February 11, 2020 12:15 PM ��� To: ��� Subject: Re: Monitor Uniformity study � �� ����Here you go, ��� ����Andrew ��� �