If the manipulation of the photograph does not result in the alteration of very essential features that can add to the ongoing case, then manipulation may not make the photograph more or less truthful.
Manipulation of evidence is the alteration of the essential elements of an exhibit.
If the manipulation of a photograph enhances the color so that images are clearer, then this might not affect the evidence. But if it erases essential features, then it might skew the proceedings.
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