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Could two similar signatures be copies of the same image? What does a scan leave out? Start with a question, explore an example and see how far the evidence takes you.
Imaging and preservation (9)
Capturing the whole page
A full-page view records context. A separate close-up records detail.
Imaging and preservationImage formats and compression
The way an image is saved affects what remains available for comparison.
Imaging and preservationLighting and reflections
A reflection can hide part of a line even when that part is present on the paper.
Imaging and preservationMetadata and dates
A single file can carry several dates, each associated with a different event.
Imaging and preservationPDF files and OCR layers
Text copied from a PDF may have been generated by automatic recognition.
Imaging and preservationPerspective distortion
Camera angle can change the apparent proportions of a page.
Imaging and preservationRecording provenance and custody
A transfer record explains how a file arrived and what happened to it afterwards.
Imaging and preservationResolution and sharpness
Pixel count alone does not determine whether an image is fit for comparison.
Imaging and preservationValidating a digital signature
A certificate-based signature is checked in the signed file using a validation tool.
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