In the conventional machine, when a glossy object such as a precious metal was scanned, an abnormal image (horizontal streak) was generated. In this machine, “Shiny Materials" mode selection has been added as a scanner application reading condition as a countermeasure.
Select: Scan Settings > Original Type > Full Color: Shiny Materials
During original scanning, light from the light source [B] is irradiated on original [A], and the specularly reflected light [C] is incident on the CCD [F] via the mirror [D] and the lens [E].
When the original [A] has shiny material on its surface, the specularly reflected light [C] becomes strong, and when an excessive light amount enters the CCD [F], lateral streaks are generated.
In the Shiny Materials mode, the light amount is reduced so as not to cause lateral streaks, and scanning is performed. The amount of light in the glossy mode is 16% at the normal time and can be changed by SP4-856-001 (Shiny Materials Mode: PWM Duty).
- [A]: Light amount at 100% for normal scanning
[B]: Light amount at 16% for Shiny Materials mode
When using this mode, the following side effects occur.
- Degradation of image area separation performance (picture/character misjudgment, streak emphasis processing)
- Graininess (feeling of the roughness of image) deteriorated