The step everything else rests on
To change colour on an image, a system has to know precisely which pixels are hair. It sounds trivial and it isn't: the edges of a head of hair are not clean, fine strands overlap the background, and in backlight the distinction between hair and air becomes ambiguous.
When the separation is imprecise the flaw shows immediately, even to someone who doesn't know what they are looking at: a coloured halo on the forehead, the tip of an ear changing tone, the fine hairs along the outline staying the original colour. It is an error you cannot explain away to a client, and it undermines the credibility of the whole consultation.
It is one of the reasons the Saloria method does not close on a generated preview but on a written look plan. The photograph is still useful — for reading the face, for the client record and for documenting the journey — and the shooting conditions that made segmentation reliable are the same ones that make a photo useful in consultation.
What makes a photo usable in consultation
The chart is qualitative and shows how much each shooting condition affects the quality of the photo used in consultation.
Shooting errors and consequences
The table links the most frequent errors to what they make impossible and how to avoid them at the chair.
| Error | What it causes | How to prevent it |
|---|---|---|
| Backlight | Outline and colour base unreadable | Diffused light on both sides |
| Background close to the hair | Hair outline indistinguishable | Light wall, contrasting with the base |
| Hair over the shoulders | Lengths and sections not assessable | Hair behind the shoulders, shoulders clear |
| Varying distance | Photos not comparable over time | A fixed shooting point |
How to get a usable photo
Set up the shooting point
Neutral contrasting background, light on two sides.
Arrange the hair
Behind the shoulders, forehead clear.
Keep the distance
Always the same, so photos can be compared.
Retake if unreadable
A bad photo is worth less than no photo.
At the chair
- Set up a fixed shooting point with a neutral background and double side light.
- Always use the same distance: that is what makes photos comparable over time.
- If the photo is unreadable, retake it instead of using it.
Having a stable shooting point in the salon solves almost every problem. You don't need a photo set: a light wall, two diffused light sources and a repeatable distance are enough to make captures comparable between different colleagues and between visits months apart.
Consistency matters more than sensor quality. Two photos with different light can suggest a colour progression that never happened, or hide a real one: which is why the shooting point is defined once and not moved.
An AI consultation designed for the salon's real work
Saloria guides the journey on tablet next to the client: welcome, profile, face analysis, look plan, technical protocol and closure. The salon doesn't sell magic, it sells a clearer method to decide cut, color and maintenance path.
Frequently asked questions
What is hair segmentation for?
To separate hair from the rest of the image: it is what every automatic colour preview rests on, and also its most fragile point.
Does Saloria generate colour previews?
No. The method closes on a written look plan: the photo serves face reading, the client record and documentation of the journey.
Do you need a professional camera?
No. You need stable lighting, a contrasting background and a constant distance: they matter far more than sensor resolution.