Detail Refinement: When It Improves a Frame and When It Ruins It

Besides generating from scratch and generating from a photo, there is a third mode: refining an image that already exists. It occupies a special place because it does not create a new frame but works on top of an existing one.

What happens during refinement

The model takes a finished image, noises it lightly and runs generation again with little freedom. Composition, pose and overall look are preserved; what changes is fine structure: skin and fabric texture, object edges, hair detail.

The key point: the detail does not emerge from the original image — it was never there. It is synthesised anew from what the model considers plausible for that region.

Where refinement genuinely helps

• A soft, plastic-looking generation short on texture.
• A frame heading for print, where fine structure becomes visible on paper.
• An image after enlargement, where detail was smeared.
• Landscapes, interiors and product scenes — invented texture is harmless there and improves perception.

Where it hurts

• A portrait with good likeness: refinement redraws the face and can shift the features.
• A frame that already looks natural: amplified texture makes it read as heavily processed.
• Images where documentary accuracy matters: the added detail does not correspond to reality.
• Stylised illustration with deliberately smooth surfaces.

Why you should not refine twice

Each pass adds invented structure on top of previously invented structure. After a second pass the image looks overloaded: excessively crisp hair, unnaturally pronounced skin texture, halos along contours.

It shows most on portraits: the face acquires a characteristic over-processed look that reads as manipulation faster than the original softness did.

Refinement and likeness

For portraits this is the main risk. Redrawing the face, the model relies not on the person's original photograph but on the generated image. It refines what it sees, and can amplify a discrepancy that was already there.

A practical recommendation: compare the face before and after at the same scale. Extra detail is rarely worth lost recognisability.

The order of operations

1. Get a frame with the right composition and likeness.
2. Select the best variant from several runs.
3. Crop to the target format.
4. Refine once, if texture is lacking.
5. Enlarge, if print size requires it.

The reverse order — enlarge first, then refine — produces more invented content and is harder to control.

When to regenerate instead

Refinement does not fix errors of composition, anatomy or light. Six fingers stay six, merely more detailed. A wrong shadow direction persists. If the problem is structural, you need a new run, not a polish.

A simple criterion: refinement improves what is already right. It does not make right what is wrong.