How to Approach Chemical Stains in an Old Photo Scan
By ImgHeal · Updated
Document unusual color or density changes before making a restrained digital correction.
Protect the original first
A stain's appearance does not identify its chemistry or show whether the original is stable. Avoid home treatments. Scan or photograph the complete print under neutral light, and keep a color capture even when the underlying image is black and white.
Record the visible damage
Use a duplicate to test local color and tone changes. Compare stained areas with nearby image content, but do not force every region to the same color when the original process or aging is uneven.
Review the digital result
Review faces, pale clothing, and highlights for lost detail. A neutral-looking result may still misrepresent the surviving print, so keep the color source scan and describe the edit as a digital interpretation.
Check before you finish
- Keep a color condition scan.
- Avoid guessing the stain's chemistry.
- Compare highlights and skin carefully.
Further reading
- Library of Congress: Care, Handling, and Storage of PhotographsSafe handling guidance for photographic originals; a digital edit does not conserve the physical object.
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