Calibration is complex because the thresholds are tight but with Eora 3D it is a one-off process so the effort is worth it!
Here are a few fundamentals to keep in mind throughout the calibration process.
FLAT means FLAT : Seriously. The calibration board needs to be as flat as possible. We realise the flaw in the design of the calibration board but do ensure there is no tilt in any orientation. We recommend sticking the calibration board to the EORA 3D box it came in using blue tac or some adhesive to ensure it remains flat.
How High? : The calibration board needs to be raised on something. We suggest using the EORA3D turntable or a stack of business cards.
Head On : Position the scanner so it is facing the calibration board as directly as possible. Double check to make sure the scanner is NOT tilted as well.
Same Scan, Same light: As a rule of thumb ,when performing scans, ensure the lighting is constant. This is specifically vital during calibration.Note: Halogen lights cause flicker as they oscillate at a frequency not visible to the human eye. Best to avoid calibration and scanning under halogen lights. Do scan in as much natural light, indoors as possible.
Reflect me not: Do your best to avoid any reflections (or shadows) on the calibration board. The calibration process will illustrate where the reflection is occurring but this is something worth keeping in mind as well during calibration or any future scans.
The above pointers will help to keep in mind and troubleshoot if your calibration seems to constantly fail(and if your scans are not turning out the way they should).