Quantify Out Of Gamut Colors

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How do I find out how far the colors have moved, tranforming from one profile to my output profile?

I need to have quantifiable data, such as delta E differences.

The problem

You need to know how far one color is from another color. More specifically, how far a color is from the gamut boundary of a printer profile with which you intend to print the color.

This procedure can be done with either a picture, a portion of a picture, sampled colors from an image, or a color list you make up yourself.


The solution

  1. Bring your image or color list into ColorThink Pro. (It opens automatically in the Worksheet.)
  2. Choose the eye dropper and select the colors in the image you wish to sample. A color list is automatically populated below in the "Colors" section.
  3. Click and drag your printer profile onto the image in the Worksheet. This reflects what will happen to the colors of your image when it gets printed.
  4. Click on the "<untitled list>" drop down box and you can choose to save out your list (optional) or choose "Graph List."
  5. Click on the dE button to see a visual representation of the delta E differences in the image.



a simple gamut warning procedure

For a simple gamut warning procedure in ColorThink Pro:

  1. Bring an image into ColorThink Pro. (It opens automatically in the Worksheet.)
  2. Drag your printer profile onto the image to open the next transform,
  3. Click on the dE button

The illustration (right) shows how you can follow the transformation of the image from its working space through the printer profile. By clicking on the dE button, the image is displayed showing how far away the different parts of the image are. The smaller "Delta-E" window has a slider control which allows you to adjust which delta E ranges are represented by which colors.


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