Photographic Triad
Definition
The mandatory three-shot sequence for every piece of crime-scene evidence: overall (wide context), mid-range (relational to a fixed scene landmark), close-up (macro of the evidence itself, with and without scale).
Related terms
- ABFO #2 Scale
- American Board of Forensic Odontology scale number 2. A right-angle (L-shaped) ruler with three circles at known spacing, used to correct perspective...
- Alternate Light Source (ALS)
- A device emitting light at selected wavelengths (typically 415 to 535 nm) used to detect biological fluids that fluoresce or absorb light...
- BSA 2023 Section 63
- Bharatiya Sakshya Adhiniyam 2023 Section 63 (the successor to Section 65B of the Indian Evidence Act 1872): the electronic-record certificate that authenticates...
- Oblique Flash
- Off-camera flash held at a low angle (typically 15 to 30 degrees) to the surface plane. Used to highlight impressed evidence (tool...
- Photogrammetry
- A technique that uses overlapping photographs to reconstruct three-dimensional geometry from two-dimensional images. In forensic engineering, photogrammetry and Structure-from-Motion (SfM) software allow...
- Photographic Triad Shot Count
- Minimum examiners-favoured rule: three shots per item of evidence (overall, mid-range, close-up with scale) plus one close-up without scale. The without-scale frame...
- RAW Capture
- Lossless sensor-data file format (Nikon NEF, Canon CR2/CR3, Sony ARW). Preserves the unprocessed image for evidentiary integrity, allows non-destructive white-balance and exposure...
Explained in
- Forensic Photography: Types and ApplicationsThe mandatory three-shot sequence for every piece of crime-scene evidence: overall (wide context), mid-range (relational to a fixed scene landmark), close-up (...