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It is considered important to ensure the original photograph is minimally damaged by environmental changes or careless handling. However, the digitization process itself contributes to the object's wear and tear. Creation of digital surrogates allows originals to be preserved.
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Handling practicesįragile or valuable originals are protected when digital surrogates replace them, and severely damaged photographs that cannot be repaired physically are revitalized when a digital copy is made. Traditionally, preservation efforts focused on physical photographs, but preservation of a photograph's digital surrogates has become of equal importance. Photographic material is susceptible to physical, chemical and biological damage caused by physical forces, thieves and vandals, fire, water, pests, pollutants, light, incorrect temperature, incorrect relative humidity, and dissociation (custodial neglect). Image processing techniques such as image enhancement and image restoration are also applicable for the purpose of digital photograph restoration. Unwanted color casts are removed and the image's contrast or sharpening may be altered in an attempt to restore some of the contrast range or detail that is believed to have been in the original physical image.
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Raster graphics editors are typically used to repair the appearance of the digital images and add to the digital copy to replace torn or missing pieces of the physical photograph.Įvidence of dirt, and scratches, and other signs of photographic age are removed from the digital image manually, by painting over them meticulously.
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