1. of or relating to photographic film or plates that are sensitive to blue and green light but not to red light
Usage: technical; photography
2. of or relating to a color reproduction process that accurately represents colors as they appear to the human eye
Usage: technical; color science

Examples

• Orthochromatic film was commonly used in early black-and-white photography.
• The photographer chose orthochromatic plates because they rendered blue skies darker than panchromatic alternatives.
• Orthochromatic emulsions are insensitive to red wavelengths, making them unsuitable for certain applications.
• Modern digital cameras have largely replaced orthochromatic film in professional studios.
• The orthochromatic process provided excellent contrast in landscape photography.