Foundational Concepts & Principles Flashcards

Why must a forensic photographer avoid using HDR (High Dynamic Range) composite images as primary evidentiary photographs?

Answer: HDR processing alters pixel data through tone-mapping, potentially misrepresenting the actual scene lighting

HDR processing merges multiple exposures and applies tone-mapping algorithms that alter original pixel values, raising authenticity concerns in court.

What is the purpose of photographing a crime scene using overlapping fields of view?

Answer: To ensure complete, gap-free coverage so no area of the scene is undocumented

Overlapping fields of view ensure that every portion of the scene is captured in at least two images, eliminating coverage gaps that could leave evidence undocumented.

Which file format is preferred for archiving original forensic photographs to best preserve image data and metadata integrity?

Answer: RAW (camera native format) or TIFF without compression

RAW or uncompressed TIFF files preserve all original sensor data and EXIF metadata without lossy compression artifacts, maintaining evidentiary integrity.

A witness claims a photograph misrepresents the actual color of evidence. How can a forensic photographer proactively counter such a challenge in court?

Answer: Include a color calibration reference card (such as a ColorChecker) in at least one photograph of the evidence

A color calibration card photographed under the same lighting conditions provides an objective, verifiable reference that courts can use to assess color accuracy.

In forensic photography, what does 'photo integrity' primarily refer to?

Answer: The assurance that an image has not been altered from its original captured state

Photo integrity means the image accurately represents what was captured at the scene and has not been manipulated or altered after the shutter was released.

What is the recommended practice when photographing shoe impressions in soil to best capture three-dimensional detail?

Answer: Use oblique (side) lighting at a low angle to create shadows that reveal depth and texture

Oblique lighting from a low angle creates shadows within the impression's ridges and grooves, making three-dimensional detail visible in a two-dimensional photograph.

Which principle requires a forensic photographer to document the scene as found, without staging or rearranging elements for a more visually clear image?

Answer: The principle of scene integrity and truthful representation

Scene integrity requires documenting the actual condition of the scene as discovered, ensuring photographs are truthful records rather than staged compositions.