HDR Soft Pro - 4.2 - Macintosh Manual do Utilizador descarregar pdf (Página 30)

Photomatix Pro User Guide 28

AEB Mode

(Automatic Exposure Bracketing). DSLR cameras and some compact digital cameras

oer this feature. It enables you to automatically take three or more exposures in a

row: one at the proper exposure, one or more underexposed, and one or more over-

exposed.

Aperture Priority

In Aperture Priority mode, you select the aperture and the camera determines the

correct shutter speed for the available light. The shutter speed also depends on ISO

sensitivity. This is the right mode for shooting bracketed shots for HDR (refer to Sec-

tion 1 for more information).

Bit

Bits represent digital data in computers. Digital Images are made of bits. A bit depth

corresponds to 2^(Bit Depth) levels (e.g. 256 for 8-bit).

Bit Depth

The number of bits a le type uses to represent a pixel's color at a given location in an

image.

Bracketed images

A group of photos taken with the Automatic Exposure Bracketing function of a cam-

era, resulting in photos of the same scene taken with dierent exposures.

Chromatic Aberration

As the lens focuses dierent wavelengths slightly dierently, chromatic aberration

occurs. For example, the purple fringing you often nd around edges (leaves in front

of a bright sky).

Contrast Ratio

Another way to describe the dynamic range of a scene. The ratio between the darkest

and brightest areas.

dSLR

Digital Single Lens Reex camera.

Dynamic Range

In the context of HDR photography, the total range of light intensity in a scene, from

the deepest shadows to the brightest highlights.

EXIF

The Exchangeable Image File header contains information about the image, the cam-

era, location, date and time and camera settings.

Exposure

The amount of light that enters a camera for the length of time the shutter is open.

Exposure depends on aperture and shutter speed, as well as the camera’s sensitiv-

ity to light (controlled by the ISO). "Exposure" is also shorthand for a photograph or

frame (a frame of lm).

Exposure Fusion

Combination of photos of the same scene taken under dierent exposure settings

in such a way that highlight details are taken from the underexposed photos and

shadow details from the overexposed ones.

EV (Exposure Value)

A measure of exposure which is the equivalent of a stop. In the absolute sense, EV

is dened as the exposure from a photo taken at 1 second, f/1, and ISO 100. In the

relative sense, the correct exposure is normally 0 EV and any deviation is measured in

positive or negative EV from that mark.

Glossary

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