Monday, 27 May 2019

photoshop - How to use a Xrite Colorchecker on a specific image to get the right colors?


I installed a setup, and I shot three photos with the same f/1.7 1/100s ISO100 condition:



How to use the Xrite Colorchecker (in photos A or B) to get calibrated colors, so that photo C will have proper colors?


Tools: Photoshop + Camera Raw + "ColorChecker Camera Calibration software v 2" (from Xrite), or any other freeware, but not Lightroom


Note: I've read many blog posts, tutorials, but it does not look so simple to do, thus this question ; please note that I don't want to make a "profile" for future use with this camera, but only to modify the colors for this specific picture / these specific lighting conditions.




Answer



Here is a useful tutorial, and a documentation in PDF: White Balance and Colour Calibration Workflow in Photoshop with the X -Rite ColorChecker Passport (Adobe Camera Raw 10.3 and Later).


The workflow is:



  1. Shoot in RAW or DNG an image with the Colorchecker visible with good lighting

  2. If needed, convert the RAW to DNG (either using Lightroom > Export > Filetype > DNG or using DNG converter

  3. Use Xrite's "Colorchecker Camera Calibration" software in DNG mode to open the photo

  4. Save the exported profile as .dcp file in C:\Users\User\AppData\Roaming\Adobe\CameraRaw\CameraProfiles


  5. Open the image in CameraRaw and choose the profile in the Profile Browser:






  6. Working!






Failing methods I've tried (when using JPG or TIFF files):





  • Use Xrite's "Colorchecker Camera Calibration" software in TIFF mode (from a JPG converted to TIFF). The output is an .icm file, and I haven't found how to use this .icm in Photoshop or CameraRaw




  • Convert a JPG to DNG with DNG Converter: not working




  • Convert a JPG to DNG with Lightroom > Export: working, but:




    • this DNG cannot be read in Xrite's "Colorchecker Camera Calibration"





    • this DNG can be opened by Adobe's DNG_Profile_Editor_win_1_0_4.exe, and the latter can detect the Colorchecker and output a .dcp or .dcpr. But unfortunately, even when copying this .dcp in C:\Users\User\AppData\Roaming\Adobe\CameraRaw\CameraProfiles, this profile doesn't appear in the Profile Browser when opening CameraRaw with a JPG/TIFF






Conclusion: it doesn't work at all with JPG/TIFF (or JPG/TIFF converted to DNG), but it works with true RAW/DNG files.




Other methods I've tried (when using DNG files as input):




  • Use Adobe's DNG_Profile_Editor_win_1_0_4.exe: the output .dcp profile gives another color rendering than the one I obtain with Xrite's "Colorchecker Camera Calibration", when using it in CameraRaw.


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