IPA: /ˌɔːrθoʊˈkrɒmətɪk/
KK: /ɔrθoʊˈkrəʊmətɪk/
Relating to photography, this term describes a type of film that accurately reproduces colors except for red, allowing for better representation of tones in images.
The photographer used orthochromatic film to capture the landscape without the influence of red hues.
Ortho- comes from Greek 'orthos' (meaning straight or correct), 'chroma' comes from Greek 'chroma' (meaning color), and '-tic' is a suffix used to form adjectives. The word 'orthochromatic' refers to something that is sensitive to all colors in the visible spectrum, thus 'correctly colored'.
Think of 'straight' or 'correct' ('ortho-') and 'color' ('chroma') to remember that 'orthochromatic' means something that accurately represents all colors.