A paper signature is compared with tablet signature images

If a disputed signature was written on paper but references used a tablet stylus, line differences may reflect surface and capture conditions. In this typical case only images from an electronic document are supplied. Determine which writing features remain and which data are absent.

What needs to be clarified

Assess comparability of paper and digital signatures, effects of capture and rendering, and the additional samples needed for a justified handwriting comparison.

Materials to prepare

The original paper document bearing the signature
Original digital signature files and dynamic data if retained
Known paper samples and tablet, stylus and software details

What to compare

Compare elements, connections and layout against ordinary variation. Check scaling, smoothing and digital sampling, recording which coordinates, timing and pressure actually survive. Do not equate paper pressure with screen-line thickness or infer missing dynamics from a static image as measured features.

Possible outcome of the analysis

A suitability assessment may list comparable features and technical distortions; the writer question may remain unresolved until suitable samples are obtained.

Limits of the conclusions

A signature image cannot replace original dynamic data. Handwriting comparison does not automatically verify cryptographic signatures, signing authority or the legal validity of a document or transaction.