Appendix A Creating a Good Image
A-8 Visionscape FrontRunner™ User’s Manual v4.1.3, April 2012
Diffuse Versus Point-Source Lighting
Diffuse light, as shown in Figure A–4, casts no shadows, minimizes glare,
and appears to originate from no particular direction. Most inspection
applications work best with diffuse light.
FIGURE A–4. Diffuse Light
Good sources of diffuse light include:
• Fluorescent ring lights
• Long fluorescent bulbs with or without diffusers
Point-source lighting, as shown in Figure A–5, casts very strong shadows.
This is desired when the presence or absence of a shadow can reveal
information about the presence of depth. Points sources are effective for
revealing surface defects.
Fluorescent Bulb
Light Diffuser
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