What a camera needs to see solvent bite on a pharma label
Look where two colours overlap. A single-colour solid will not show it. A steady sight needs about 3 pixels. If you cannot see it clearly, do not loosen the threshold.
To see solvent bite on a pharma label, look where two colours overlap. A single-colour solid will not show it. 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
The later colour bites the earlier one and thickens it. If the image cannot separate them at all, moving the threshold only paints the legal type and the barcode solid red. Look where two colours overlap. A single-colour solid will not show it.
Optics
| Need | Enough looks like | Not enough looks like |
|---|---|---|
| Look where two colours overlap. A single-colour solid will not show it. | The later colour bites the earlier one and thickens it. | Only a blurry circle left |
| About 3 pixels across | Shows up steadily | Comes and goes, and you still write that it can be detected |
| Legal type and the barcode in the field of view | The critical spot is seen | Only the decorative edge is lit |
Try it on a sample
- Confirm the image can separate it: The later colour bites the earlier one and thickens it.
- Count about how many pixels it spans.
- If you cannot see it clearly, change the light or the focus. Do not change the threshold.
