So if you don't create any reference file with the colors you like, how do you calculate the color matrix based on the uncorrected sensor color and the color you like? I would appreciate your help. David On Mon, Feb 11, 2013 at 7:06 PM, Ben Goren <ben@xxxxxxxxxxxxxxxx> wrote: > 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 describing.... > > b& > > 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. >>> >>> >> > >