[Cause]
Could not identify colours measured from the given area. This may be due to:
1. A portion of the designated area is mirrored.
2. Specular reflection from the lighting in part of the specified region makes it appear white in the image.
3. Several colours were taken within the designated area.
4. The colour changes according to the contour of the measure object.
[Countermeasure]
For their respective reasons, the response is as follows:
1. Please change the lighting configuration to avoid a shadow.
2. Change the lighting arrangement to avoid specular reflection.
3. Cover the colours other than those you are going to measure.
4. Mask colors that appear darker because of surface unevenness.