Re: Real-world RGB numbers for the ColorChecker SG
Re: Real-world RGB numbers for the ColorChecker SG
- Subject: Re: Real-world RGB numbers for the ColorChecker SG
- From: Dan Reid <email@hidden>
- Date: 24 Jun 2005 12:51:14 -0700
- Date: Fri, 24 Jun 2005 12:43:32 -0700
on 6/24/05 6:14 AM, email@hidden at email@hidden
wrote:
> Dan,
>
> One warning on using i1 Share for RGB: i1 Share 1.4 uses
> "Absolute Colorimetric" for its transformed RGB data.
> Version 1.3 used "Relative Colorimetric".
>
> Richard will likely expect the RelCol values. It is better
> to use the L*a*b* values with i1 Share.
>
> Danny Pascale
>
> dpascale AT BabelColor DOT com
> www.BabelColor.com
> BabelColor, color translation and analysis
>
Good point. Thanks for the clarification.
--
Dan B. Reid
RENAISSANCE PHOTOGRAPHIC IMAGING
Color Management Products & Training for Print, Internet, & Motion Graphics
http://www.rpimaging.com | Toll Free: (866) RGB-CMYK
>
> On 23 Jun 2005 21:03:04 -0700,Thu, 23 Jun 2005 20:55:45
> -0700
> Dan Reid <email@hidden> wrote:
>> on 6/23/05 10:33 AM, Richard at
>> email@hidden wrote:
>>
>>>
>>>
>>>> -----Original Message-----
>>>> From:
>>>> colorsync-users-bounces+richard=email@hidden
>>>> [mailto:colorsync-users-bounces+richard=rwc.my-
>>>> email@hidden] On Behalf Of Dan Reid
>>>> Sent: Thursday, June 23, 2005 4:16 AM
>>>> To: Rich Apollo
>>>> Cc: colorsync
>>>> Subject: Re: Real-world RGB numbers for the ColorChecker
>>>> SG
>>>>
>>>> Short answer, measure the dang chart!
>>>
>>> What is the procedure for doing that and producing a
>>> file.
>>>
>>
>> If you have a Spectroscan or EyeOne you simply measure
>> in GretagMacbeth
>> ProfileMaker MeasureTool and save the measurement data.
>>
>> If you want RGB numbers for a particular RGB colorspace
>> you can use the free
>> Eye One Share with the Eye One to determine the RGB
>> equivalents for each
>> spot measurement sample. Teadious. Or use a
>> GretagMacbeth Spectroscan with
>> ProfileMaker ColorPicker and select RGB colorspace. Or
>> you can do this also
>> in X-Rite ColorShop X using an Eye One and the Profile
>> Calculator option. Or
>> ........ :)
>> --
>> Dan B. Reid
>> RENAISSANCE PHOTOGRAPHIC IMAGING
>> Color Management Products & Training for Print,
>> Internet, & Motion Graphics
>> http://www.rpimaging.com | Toll Free: (866) RGB-CMYK
>>
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