TERMIUM Plus^®

Record 1,  Textual support,  English

Record number: 1, Textual support number: 1 DEF

An instrument which records eye movements during reading by photographing, on a moving strip of film, light reflected from the corneae.  2, record 1, English, - ophthalmograph

Record 1,  Textual support,  French

Record number: 1, Textual support number: 1 DEF

Dispositif permettant d'enregistrer les mouvements des yeux, notamment pendant la lecture.  1, record 1, French, - ophtalmographe

Record 1,  Textual support,  Spanish

Record 2,  Textual support,  English

Record number: 2, Textual support number: 1 DEF

The measurement by a light meter of the amount of reflected light being bounced off the subject.  2, record 2, English, - reflected%20light%20reading

Record number: 2, Textual support number: 1 OBS

This is the normal way of metering the brightness of a scene to be photographed. This takes into account the color and reflectivity of the subject as well as the brightness of the illuminating source.  3, record 2, English, - reflected%20light%20reading

Record 2,  Textual support,  French

Record number: 2, Textual support number: 1 DEF

Mesure effectuée par un posemètre de la lumière réfléchie par un sujet.  2, record 2, French, - mesure%20en%20lumi%C3%A8re%20r%C3%A9fl%C3%A9chie

Record number: 2, Textual support number: 1 OBS

La manière habituelle de mesurer la luminance d'une scène, c'est de mesurer la lumière réfléchie par le sujet en direction de l'appareil.  3, record 2, French, - mesure%20en%20lumi%C3%A8re%20r%C3%A9fl%C3%A9chie

Record number: 2, Textual support number: 2 OBS

La mesure tient compte aussi bien de la réflectance et de la couleur du sujet que de la quantité de lumière qui l'éclaire.  3, record 2, French, - mesure%20en%20lumi%C3%A8re%20r%C3%A9fl%C3%A9chie

Record 2,  Textual support,  Spanish

Record 3,  Textual support,  English

Record number: 3, Textual support number: 1 CONT

The incident light reading is technically more accurate than reflected light reading because it involves measurement of the brightness of the illuminating source, regardless of the subject. A reflected light reading is taken from camera position, but an incident light reading involves aiming the meter, fitted with an incident light adapter, toward the light source from subject position. On this basis, subjects reproduce as dark or light in the picture according to their natural reflectivity.  1, record 3, English, - incident%20light%20reading

Record number: 3, Textual support number: 1 OBS

This method is best for color reversal work or the photography of very dark or light subjects.  1, record 3, English, - incident%20light%20reading

Record 3,  Textual support,  French

Record number: 3, Textual support number: 1 CONT

La mesure en lumière incidente est théoriquement plus précise que celle en lumière réfléchie, puisque ne tenant compte que de la lumière frappant le sujet; elle est effectuée en se plaçant contre le sujet principal et en dirigeant le posemètre -- coiffé d'un cône diffuseur -- vers l'objectif de l'appareil. La mesure ne tenant pas compte de la valeur claire ou foncée du sujet, celui-ci est traduit par une densité d'image correspondant à sa réflectance.  1, record 3, French, - mesure%20en%20lumi%C3%A8re%20incidente

Record 3,  Textual support,  Spanish

Record 4,  Textual support,  English

Record number: 4, Textual support number: 1 DEF

A card with an 18 percent gray tint(reflectance) used to determine exposure by taking a meter reading from subject light reflected by the card.  4, record 4, English, - neutral%20test%20card

Record number: 4, Textual support number: 1 CONT

Neutral test card. A panel, usually with an 18% reflectance gray surface on one side and a 90% reflectance white surface on the other. Such a card is useful as a standard object for light measurement in estimating the required camera settings, and also for checking color balance in color images.  5, record 4, English, - neutral%20test%20card

Record 4,  Textual support,  French

Record number: 4, Textual support number: 1 DEF

Carte gris neutre [...] dont la réflexion est de 18 %, ce qui correspond à un sujet moyen.  1, record 4, French, - charte%20de%20gris

Record number: 4, Textual support number: 1 OBS

On la place devant le sujet et on mesure la lumière qu'elle réfléchit, cette méthode permettant de faire abstraction de la couleur du sujet, de son éventuel aspect composite ou très contrasté ou de l'influence des sources d'éclairage.  1, record 4, French, - charte%20de%20gris

Record 4,  Textual support,  Spanish

Record 5,  Textual support,  English

Record number: 5, Textual support number: 1 DEF

An instrument in which the reading is given by the movement of a beam of light reflected from a mirror affixed to the moving element.  1, record 5, English, - mirror%20instrument

Record 5,  Textual support,  French

Record 5,  Textual support,  Spanish