Silvercrest DV-767 User Manual download pdf (Page 47)

24 Technical Help

This chapter explains some technical terms. No claims are made regarding completeness and

accuracy.

24.1 White Balance (WB)

The WB (white balance) is used to set the colour temperature. This adjusts the camera so that it is

ideally suited for the light conditions in the desired location. If this WB is fully automatic, then the

camera looks for a white area (or similar) in the picture and uses this as a basis to calibrate all

other colours. In reality, this area is seldom white. More often than not it is simply the lightest area

in the screen. This often results in colour fog. Using semi-automatic WB (setting the camera to

certain, defined lighting conditions) can often reduce this colour fog. However, this only works with

standard lighting conditions. In mixed light it can lead to poor results.

24.2 EV Bias

You can use the EV bias to manually change the predefined exposure value for the exposure

meter. This correction makes the image/video lighter or darker than predefined by the shutter. As a

rule, the shutter priority is not optimal in the following cases, and requires the exposure to be

manually corrected:

 Back light: If the object being captured is illuminated by back light (for example, a portrait with

the sunset in the background), a shutter priority normally results in the image being too dark. A

longer exposure (such as +2) generates a better image.

 High-key image: In the case of light objects in front of a light background, an automatic

exposure generally results in a gray image. A longer exposure (such as +2) generates a better

image.

 Low-key image: In the case of dark objects in front of a dark background, an automatic

exposure generally results in a gray image. A shorter exposure (such as -2) generates a better

image.

24.3 Range of Exposure Measure

The DV-767 camera has a shutter priority, which undertakes the appropriate exposure for the

image/video. For this, the camera measures the brightness at various points on the image to

determine the exposure time. In normal cases, the image should be exposed in such a way that the

subject is well lit. As the subject is usually located in the centre of the image, the “Centre” setting is

suitable for almost all captures. If the subject in the centre of the image is very small, then the

exposure can only be measured at one point in the centre of the image (“Spot” setting). If, on the

other hand, the exposure measurement should be distributed over the entire image, then you

should select the “Matrix” setting. This setting delivers good results for images that are equally

illuminated.

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Silvercrest DV-767 User Manual Page 47