[argyllcms] Re: Extract L*a*b, XYZ values from a target image using scanin

  • From: Ben Goren <ben@xxxxxxxxxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Mon, 11 Feb 2013 17:06:25 -0700

I take it what you really want is that matrix so that you can compile a custom 
version of dcraw? If so, I don't think you want to do that the way you're 


On Feb 11, 2013, at 4:49 PM, David Irisarri <zuiko3000@xxxxxxxxx> wrote:

> Hi Graeme,
> Thanks for your reply.
> I want to do this.
> 1. Take a picture of the Color Checker chart with the camera and
> export it in TIFF AdobeRGB (biggest color gamut of the camera, no
> color patches out of gamut)
> 2. Extract color values of these patches and create a CGATS file
> according to these values. I want these values in L*a*b and XYZ.
> 3. Process the same image with dcraw (no color management raw color)
> and create a color matrix using the reference previously created.
> David
> On Mon, Feb 11, 2013 at 6:35 PM, Graeme Gill <graeme@xxxxxxxxxxxxx> wrote:
>> David Irisarri wrote:
>> Hi,
>>> I ma David and I am trying to create a color profile. I would like to ask
>>> you guys how to extract color values from an image in order to create a
>>> CGATS file. I am using scanin but it only generates a val file with RGB
>>> values.
>> If you want to interpret the RGB image as CIE values, then you
>> have to specify the device space using an ICC profile. You
>> can use the "scanin -c" mode to do this, see
>> <http://www.argyllcms.com/doc/scanin.html#c>
>>> The image I have is in aRGB and at least I would need to extract
>>> these values in CIE L*a*b. XYZ would also be very welcome.
>>> I need to extract these values because I want to create a profile according
>>> to this TIFF image, I don't want to match the colors according to a chart 
>>> with
>>> its own values.
>> The RGB TIFF is being used as the reference values ?
>> Graeme Gill.

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