What a camera needs to see foil pinholes on corrugated preprint
To see foil pinholes on corrugated preprint, straight light blows the gold white. Change to a light that holds the reflection down. If you cannot see it, change the light or the resolution first. Do not loosen the threshold first.
To see foil pinholes on corrugated preprint, straight light blows the gold white. Change to a light that holds the reflection down. If you cannot see it, change the light or the resolution first. Do not loosen the threshold first.
If you cannot see it, change the optics first
Small spots in the gold show the color underneath. If the picture cannot separate that, loosening the threshold only paints the barcode and the product name red. Straight light blows the gold white. Change to a light that holds the reflection down.
Optics
| Need | Enough looks like | Not enough looks like |
|---|---|---|
| Straight light blows the gold white. Change to a light that holds the reflection down. | Small spots in the gold show the color underneath. | Only a blurry circle |
| About 3 pixels across | It shows steadily | It comes and goes, yet someone writes that it can be detected |
| The barcode and the product name are in view | The critical place is in view | Only the decorative edge is lit |
Try it on a sample
- Confirm the picture separates this: small spots in the gold show the color underneath.
- Count about how many pixels it covers.
- If you cannot see it, change the light or the focus. Do not change the threshold.
