Light area (paper)
When patches on the left and right are missing due to their weak contrast to the paper surface, the L value of such patches are very close to the L value of the paper, they will get removed automatically.
InkZoneMove excludes patches where the L value indicates a paper. Depending on the paper itself (coated, uncoated etc), the L is somewhere between e.g. 90 and 95. The critical L for a yellow patch are somewhere between e.g. 84 to 89.
Coated
Uncoated
InkZoneMove detects the paper L value by looking at:
1. Paper white patch from scan
2. Paper white from paper white calibration
3. Paper white from targetset
Ideally, it finds a paper patch in the colobar (item 1). If there is no such patch, it takes the L value from the paper white calibration (item 2). If neither available, it looks at the paper definition in the targetset (item 3).
If you find that the patches are removed on the side, check carefully:
- is a paper white patch available in the colorbar?
- was the paper white calibration done before measuring?
- is the targetset correctly chosen for the paper?
The database setting max_L_tolerance in inkzone-central/config-move can be adjusted to a higher value when light patches were incorrectly excluded.