The profiling procedure helps to determine the gamut range of the scanner. This qualitative parameter reflects the deviation of the colors from the required values. As a result of this procedure you get a profile for the scanner that can be used later with any scanned image. Besides the profile proper, you also get the numbers corresponding to all the colors of the test target. The following gamut range diagram is based on them:
The gamut range of the scanner in the visible spectrum is identified with a triangle in the diagram. Knowing the coordinates of the vertices of the triangle we can calculate the total area of this triangle.
To build the next diagram I found the difference between the colors of the original target and the scan. The Color Difference value should not exceed 5.0 or the color discrepancies become apparent for a majority of people.
For reflective originals (the closer to X-axis, the better)
For transparent originals
That’s the end of this test session. I’ll give you a brief description of good and bad points of the scanner in the last section.