Sample and batch references preserve the connection between a review image, the item examined, and the records that explain its significance.
A photograph needs an evidence trail
A review photograph records the visible state of an item at a particular moment. Without a sample identifier, however, it may be impossible to determine which item was photographed, which test record belongs to it, or whether two images show the same sample. A sample number provides the linking key between the image, inspection notes, measurements, and report version.
A batch or lot reference adds a second boundary. It identifies the group from which the sample came, but it does not automatically prove that every unit in that group has the photographed characteristic. The NIST/SEMATECH e-Handbook explains that acceptance sampling uses information from a sample to decide whether a lot is likely to be acceptable; its purpose is not to estimate every aspect of the lot’s quality. This distinction helps prevent a sample image from being treated as a picture of all inventory.
Preserve traceability without exposing sensitive data
A useful image record can retain a sample code, partial batch reference, capture date, report reference, and original-file location. Sensitive commercial details may be masked, provided the remaining identifiers still allow an authorized reviewer to reconnect the image to the underlying records.
Captions should also state the image’s scope: what is visible, which sample is shown, and which conclusion—if any—is supported by the associated report. If the identifier-to-report mapping is lost, the photograph may remain illustrative, but its value as review evidence is substantially reduced.