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I used the Colorchecker Camera Calibration software with a TIFF photo of the Colorchecker I did with my camera. This software detected the Colorchecker successfully and produced a .icm file as output.

Then I'd like to use this .icm profile inside Photoshop/CameraRaw. How to do this?

I don't find the option to load a .icm neither in Basic > Profile near in Calibration tab:

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Usually, in the Adobe Camera Raw or Lightroom, the way that camera characterisation is done is via custom .dcp profiles, those are created with the Adobe DNG Profile Editor. The documentation explains how to create them:

Step 1 Step 2 Step 3 Step 4

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  • Thank you. It works indeed when using DNG files as input (after putting the .dcp file in the right folder, for Win: C:\Users\User\AppData\Roaming\Adobe\CameraRaw\CameraProfiles) ; the color calibration is slightly different than the one obtained with "Colorchecker Camera Calibration" software. (PS: when opening JPG or TIFF files with CameraRaw, the .dcp profile made with DNG Profile Editor doesn't appear. So the only solution is to use RAW)
    – Basj
    Nov 4 '19 at 21:18
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Here are my conclusions for now after further research:

  • Using Xrite's "Colorchecker Camera Calibration" software in TIFF mode produces .icm files. It probably cannot be used easily in Photoshop (?), or at least not in the normal CameraRaw workflow.

  • Using Xrite's "Colorchecker Camera Calibration" software in DNG mode produces .dcp profiles that can be easily used in CameraRaw (when opening DNG files only; when opening JPG/TIFF files in CameraRaw this .dcp profile doesn't appear).

See How to use a Xrite Colorchecker on a specific image to get the right colors? for more details.

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