Re: DigitalColor Meter (was Color accurate workflows and in search of a D50 Editing colorspace)
Re: DigitalColor Meter (was Color accurate workflows and in search of a D50 Editing colorspace)
- Subject: Re: DigitalColor Meter (was Color accurate workflows and in search of a D50 Editing colorspace)
- From: Lars Borg <email@hidden>
- Date: Wed, 10 Sep 2014 20:23:39 +0000
- Thread-topic: DigitalColor Meter (was Color accurate workflows and in search of a D50 Editing colorspace)
I don’t see how a display-based tool could ever do that.
Open a PDF with color managed images.
For example http://www.color.org/version4pdf.pdf
The Digital Color Meter has no access to the image profiles.
Without that it cannot tell you the image code values.
What it can do and seems to do well, is take the display code values & the
display profile, convert that to Lab, sRGB or Adobe RGB.
It’s amazing that in Andrew’s test PS and DCM showed the same Lab values.
Amazing as the source color could be outside the display gamut. (R and B
being zero in DCM).
PS returns the image Lab, and DCM returns the display Lab. They would
match only when there are no gamut changes for the image color.
To get to the image code values, you would need an app that reads the
actual image file and its data. That would include PS and Preview, but
not Finder nor DCM.
Lars
-----Original Message-----
From: edward taffel <email@hidden>
Date: Wednesday, September 10, 2014 at 5:36 AM
To: "email@hidden" <email@hidden>
Cc: ColorSync List <email@hidden>
Subject: Re: DigitalColor Meter (was Color accurate workflows and in
search of a D50 Editing colorspace)
>sampling display color is certainly efficacious in establishing some cm
>workflow parameters as regards displays.
>however, it [still] seems to me, a sampling tool should offer an
>image-data sample-mode: e.g., it is desirable to sample colors in an
>image’s space to find a suitable harmonizing color for other design
>elements; sampling values that have been converted to a display space (&
>possibly converting back to cmyk) will likely be off—they will almost
>certainly appear different on press.
>
>
>On Sep 10, 2014, at 10:55 AM, Andrew Rodney <email@hidden> wrote:
>
>> New test. Made a document in Adobe RGB with a value of 0/240/0.
>>Photoshop of course shows that value in the info palette.
>> I then save that with the embedded profile to the desktop as a TIFF.
>>
>> I open the document in Preview and check both values using Photoshop
>>and DigitalColor Meter:
>> I use DigitalColor Meter and set it for Display Native Value and get
>>0/231/0.
>> I use Photoshop's sampler tool to read the color, it shows the same
>>number 0/231/0.
>> I open the DigitalColor Meter and set it for Display in Adobe RGB
>>(which matches the document), I get 10/239/37! So that's useless!
>>
>> Photoshop and DigitalColor Meter read the same values when DigitalColor
>>Meter is set to Display Native Values. DigitalColor Meter set for Adobe
>>RGB is way off.
>>
>> In the finder (10.9.4). I click the space bar to show the image using
>>the Finder. Visually it does match what I see in Photoshop! The Finder
>>seems totally confused about how to preview this data using Quick Look
>>(whatever it is called when clicking spacebar to show the preview,
>>presumably from the thumbnail?) or CoverFlow. DigitalColor Meter shows
>>135/233/74.
>>
>> So the data being sucked up and read by Photoshop and Digital
>>ColorMeter are incorrect (begging the question, why read such values,
>>they are wrong). Photoshop does provide a conversion to CMYK based on
>>the numbers it picks up outside it's UI and Lab.
>>
>> There is one condition where Photoshop and DigitalColor Meter agree.
>>That's when DigitalColor Meter is set to Display in L*a*b*!
>>
>> Andrew Rodney
>> http://www.digitaldog.net/
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