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Manual HDR Photomatix Pro 2.2

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Manual

Photomatix Pro 2.2 Help 6

V - Generating an HDR image

Introduction

The Dynamic Range of an image is the ratio between its brightest and darkest parts. The ability to

reproduce the dynamic range of a scene depends on two types of limitations.

First limitation: the capturing device. Images produced by digital cameras are considered Low

Dynamic Range. Once the influence of noise and other limiting factors have been taken into

account, the maximum dynamic range avaible from most camera sensors is about 1,000:1 or

less.

Second limitation: the reproducing media. Standard computer screens can only reproduce a

dynamic range of about 100:1.

The dynamic range of real-world scenes however is much higher (ratios of 100,000:1 are common in

the natural world). Given that the human eye can accommodate a dynamic range of approximately

10,000:1 in a single view, there is a need for images that can hold a higher dynamic range than the

limited range available in images encoded with 8 bits per color channels. Those are referred to as

HDR images and are usually stored in 32-bit image formats.

Photomatix uses images of the same scene shot under different exposures in order to reconstruct the

dynamic range of the scene and generate the corresponding HDR image. The number of images

needed depends on both the stop spacing and the dynamic range of the scene considered. If your

scene has a high dynamic range (e.g. the interior of a room with an outside view on a sunny day), a

stop spacing of two will limit the number of shots necessary to cover the whole dynamic range.

For more information on how to shoot a High Dynamic Range scene, see the above section “Taking

differently exposed images”.

To create a High Dynamic Range Image from bracketed shots:

On the HDRI menu, click on the Generate HDR item.

Click on the Browse button to go to the location of your differently exposed images and select

them using the SHIFT+Arrow keys or your mouse and CTRL key.

The calculation of the HDR image requires the exposure value of each input image. If the

exposure time can not be found in the Exif data, Photomatix displays a window where you

can enter the Exposure Values for each one of your images (see note below).

If you did not use a tripod to take the differently exposed shots, check the option Align LDR

images.

Note for the case of missing exposure information:

The Exposure Values needed to be entered are relative values (i.e. values of -2, 0, +2 are the same

as 0, +2, +4 for instance). A doubling of the exposure time relates to an increment of 1 in the Exposure

Value, provided that the aperture and ISO settings did not change.

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