What a camera needs to see dot gain on a textured wine label
To see dot gain on a textured wine label, the camera picture cannot replace a tone-value reading. If you cannot see it, change the light or the resolution first. Do not loosen the threshold first.
To see dot gain on a textured wine label, the camera picture cannot replace a tone-value reading. 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 dots are larger all around than the signed sample. If the picture cannot separate that, loosening the threshold only paints the wine name and the fine type red. The camera picture cannot replace a tone-value reading.
Optics
| Need | Enough looks like | Not enough looks like |
|---|---|---|
| The camera picture cannot replace a tone-value reading. | The dots are larger all around than the signed sample. | Only a blurry circle |
| About 3 pixels across | It shows steadily | It comes and goes, yet someone writes that it can be detected |
| The wine name and the fine type 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: the dots are larger all around than the signed sample.
- Count about how many pixels it covers.
- If you cannot see it, change the light or the focus. Do not change the threshold.
