Having these visuals at zero cost means you can practice identifying patterns ten times more than with a single paid textbook image.

Excellent open-source programs for non-destructive color grading, exposure adjustment, and digital noise reduction. Essential Correction Techniques

In forensics, an ALS is a specialized tool that uses various wavelengths (ultraviolet, infrared, or visible light) to reveal evidence invisible to the naked eye. ResearchGate Evidence Detection

Imaging can detect subtle, early changes in the brain that may not be apparent on a standard MRI, providing "biomarkers" that act as a "signature" of the disease.