A "sharp photo" can mean three different information losses.
Motion grease stretches detail in direction, focus miss blurs one depth of the scene and a small file just doesn't contain enough pixels. AI helps these cases in different ways and may not always return the exact original.
Increase the contrast boundary and look at the blur shape
The double contour is noticeable in the eyes, signs and bright points.
The information was stored at a different depth, but not at the main site.
Details are lost when reduced, shipped or heavy crop.
A slight motion blur is sometimes reversible, a strong blur turns details into guesswork
If the direction is the same throughout the frame and facial features are still visible, the model can increase local contrast and produce a convincing result. With a long motion trail, it does not know exactly where the edge of the eyelid, tooth or jewelry was.
For a personal photo, plausible recovery may be enough. A document, an evidential frame or an accurate portrait needs another source.
A focus miss cannot be corrected by an ordinary sharpening
Sharpness reinforces existing boundaries. If the face is beyond depth of field, borders are already mixed with neighboring pixels. AI creates a new plausible structure by context, but does not retrieve the hidden photo.
First look for the original file, then run an improvement.
Best source: No recompression and small transitions are saved.
Suitable for the screen, but hair and skin can already be simplified.
Adds interface scaling and often trims the usable area.
Request.Reduce the short horizontal lubrication and make your face readable. Keep the shape of your eyes, nose, lips, hairline and earrings; don't add new eyelashes, teeth, or skin details that you can not see in the source.
Select a target before attempting recovery
If there is a series of similar frames, first look at the neighboring ones.
The next shot often has sharper eyes or the right posture without reconstruction. Choosing the best source is almost always more reliable than challenging recovery of a weak frame.
Do not combine different faces from the series automatically: expression, light and angle may not coincide. Use the adjacent frame as a reference only when the person, moment and perspective are really the same.
AI improves visibility, but does not reverse information loss
Honest diagnosis saves attempts: movement, focus and resolution require different actions and different tolerance to fictional details.