Create a preservation-quality source before enhancement
Scan the original at an appropriate optical resolution with neutral lighting, clean glass, correct focus, and no destructive automatic filters when possible. Preserve the full borders, annotations, studio marks, paper texture, and reverse-side information before cropping. Save a lossless archival master and work on a copy. A phone photo with glare, perspective distortion, shadows, or shallow focus gives the model inaccurate evidence and should be rescanned before enlargement.
Separate physical damage from missing visual information. Dust, scratches, folds, tears, stains, fading, silvering, and uneven exposure require different restoration judgments. Plain Upscaler is an enlargement workflow rather than a complete conservation suite; conventional cloning, tonal correction, reconstruction, or a trained conservator may be needed before or after it. Do not allow an attractive generated face to replace the only trustworthy scan.