HDR Soft Essentials - 3.2 - Windows Operations Instructions download pdf (Page 15)

13Photomatix Essentials 3.2 User Manual

Glossary

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 overexposed.

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 Section 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 levels 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

camera, resulting in photos of the same scene taken with dierent exposures.

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.

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

sensitivity 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.

HDR

High Dynamic Range.

HDR image

Strictly speaking, an HDR image is an intermediary image with 32 bits per color

channel (96 bits per pixel). An HDR image is the result of merging photos of the

same scene taken under dierent exposure settings and stored in special HDR

image format. The 32-bit intermediary HDR image must be processed with tone

mapping for proper display on standard monitors and prints. It has become very

common to dene “HDR image” as the result of processing the 32-bit HDR image

with tone mapping, i.e. the tone mapped output, but this is not technically

correct.

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