Compare 7 Color Profiles

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Comparing two 7 - color profiles

In the USA, many printers who work with seven unique colors are still using the rather dated ProfileMaker software solution to make n-color profiles. (These are profiles made from 5, 6, 7 or more colors that do not necessarily include cyan, magenta and yellow.) Fortunately, ProfileMaker would embed the device values and the measurement data within the Tag Table of the profile itself. These .txt files are easy to extract using ColorThink Pro.

  1. Open up any of your ProfileMaker profiles in ColorThink Pro,
  2. Go to the Tag Table in the Profile Inspector,
  3. Click on the GretagMacbeth device reference tab,
  4. Click the Open in Worksheet button. (This places the device values from your profiling target into the Worksheet.)
  5. Drag and drop your profile from the Finder (Mac), or Windows Explorer (WIn) onto the color list or the image. (This populates the device values with actual Lab values to simulate printing through the profile.)
  6. Click the New button under the Workflows area. (A new workflow will appear with an off-color image. That’s okay for now.)
  7. Drag and drop the other profile onto the 2nd workflow’s Profiles area,
  8. Click the dE button under the Workflows area to turn on dE.

This gives you a “heat map” of which colors have the highest difference. The color range can be adjusted. Also, you can click the dE column heading under the heat map to order all the values according to lowest-to-highest dE, or highest-to-lowest dE.

Note that you might want to develop a smaller, more manageable list of device values if your profiling target was quite large. Perhaps bring the color list into Excel and delete a percentage of the patches?

Also, by default the Worksheet will perform the transform using Rel Col. You can change that to a different rendering intent if you wish. (For example, some proofing workflows would use Abs. Col.)


A report comparing two measurements in the ColorSmarts Guide.

Once the measurement data has been extracted from the profiles, a report can be easily made using a procedure in the ColorSmarts Guide:

http://www.colorwiki.com/wiki/Compare_Device_Measurements


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