Thanks to Andrew and Steve for quick and informative replies. One question remains. The "stats" from xRite are based on the i1Pro2 and I'm talking about the i1Pro. Would the inter-instrument agreement specs. be the same (or close) for both instruments? Mike Stewart On 2/25/14, colorsync-users-request@lists.apple.com <colorsync-users-request@lists.apple.com> wrote:

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Today's Topics:

1. Dtp70 (Graphex) 2. Inter-Instrument agreement (Mike Stewart) 3. Re: Inter-Instrument agreement (Andrew Rodney) 4. Re: Inter-Instrument agreement (Steve Upton)

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Message: 1 Date: Mon, 24 Feb 2014 16:30:31 -0500 From: Graphex <roger@graphexsolutions.com> To: "colorsync-users@lists.apple.com" <colorsync-users@lists.apple.com> Subject: Dtp70 Message-ID: <AFDCF37E-D1BE-4872-8377-1A6C8E70BEAB@graphexsolutions.com> Content-Type: text/plain; charset=us-ascii

Hi all,

"Does anyone have a DTP70 they want to sell?" asks the frugal one.

Roger

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Message: 2 Date: Tue, 25 Feb 2014 12:38:52 -0600 From: Mike Stewart <mstewart@embassygraphics.com> To: colorsync-users@lists.apple.com Subject: Inter-Instrument agreement Message-ID: <CAFB95ovoo2+=t2at5MNomBxw-vs2UUrz39cJBbFeQH6ZYXFSuQ@mail.gmail.com> Content-Type: text/plain; charset=ISO-8859-1

Hello All: Is there some "rule of thumb" regarding spectrophotometers and inter-instrument agreement? A situation can and has appeared where we are using an I1Pro measuring the IdeAlliance colour bar. When we read the chart/bar and have the printer read the very same chart using the same brand of spectrophotometer, same Rev., same settings, same backing, etc. we get different readings. Readings where our proof may "Pass" and their measurements will generate a "fail". Obviously this is an issue. What can be done about it?

Thanks Mike Stewart

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Message: 3 Date: Tue, 25 Feb 2014 12:21:41 -0700 From: Andrew Rodney <andrew@digitaldog.net> To: ColorSync List <colorsync-users@lists.apple.com> Subject: Re: Inter-Instrument agreement Message-ID: <200ED684-093D-42E2-BCE3-BDADDED26FFC@digitaldog.net> Content-Type: text/plain; charset=utf-8

http://www.xrite.com/product_overview.aspx?ID=1912&Action=support&SupportID=...

Inter-instrument agreement: 0.4 ∆E94* average, 1.0 ∆E94* max. (deviation from X-Rite manufacturing standard at a temperature of 23ºC (73.4ºF) on 12 BCRA tiles (D50, 2º)) Short-term repeatability: 0.1 ∆E94* on white (D50,2°, mean of 10 measurements every 3 seconds on white)

Might be time for both sites to run the free i1Pro diagnostics.

Andrew Rodney http://www.digitaldog.net/

On Feb 25, 2014, at 11:38 AM, Mike Stewart <mstewart@embassygraphics.com> wrote:

...

Hello All: Is there some "rule of thumb" regarding spectrophotometers and inter-instrument agreement? A situation can and has appeared where we are using an I1Pro measuring the IdeAlliance colour bar. When we read the chart/bar and have the printer read the very same chart using the same brand of spectrophotometer, same Rev., same settings, same backing, etc. we get different readings. Readings where our proof may "Pass" and their measurements will generate a "fail". Obviously this is an issue. What can be done about it?

Thanks Mike Stewart

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Message: 4 Date: Tue, 25 Feb 2014 11:57:19 -0800 From: Steve Upton <upton@chromix.com> To: ColorSync List <colorsync-users@lists.apple.com> Subject: Re: Inter-Instrument agreement Message-ID: <7F51A789-376D-4362-9B1B-517C65CE1650@chromix.com> Content-Type: text/plain; charset=utf-8

On Feb 25, 2014, at 11:21 AM, Andrew Rodney <andrew@digitaldog.net> wrote:

...

http://www.xrite.com/product_overview.aspx?ID=1912&Action=support&SupportID=...

Inter-instrument agreement: 0.4 ∆E94* average, 1.0 ∆E94* max. (deviation from X-Rite manufacturing standard at a temperature of 23ºC (73.4ºF) on 12 BCRA tiles (D50, 2º)) Short-term repeatability: 0.1 ∆E94* on white (D50,2°, mean of 10 measurements every 3 seconds on white)

Might be time for both sites to run the free i1Pro diagnostics.

Indeed, also remove the filter attachment and clean it out. I've seen them fogged white with paper dust.

X-Rite's (likely correct) response will be to ask when each of the instruments was last re-certified and recommend that they be sent back once a year….

regards,

Steve

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