HDR Soft Pro - 5.0 - Windows Manual do Utilizador descarregar pdf (Página 5)

Photomatix Pro 5.0 User Manual 3

1.1 Setting up the Camera

• Set your camera to Aperture priority (the "A" setting) so that

only shutter speed will vary between the exposures�

• Set a low ISO such as ISO 100, or lower if available�

• Turn o the ash� The ash may try to balance the exposure of

all the images, when the goal instead is a range of exposures�

• Use a tripod whenever possible� Even though Photomatix

Pro oers automatic alignment of hand-held photos,

using a tripod is almost always better� DSLR cameras and

some compact digital cameras oer Automatic Exposure

Bracketing (AEB)� This 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�

Follow these steps if your camera oers AEB mode:

• Select the Continuous shooting mode on the camera’s

drive setting� Consult your camera manual for model-specic

instructions for using this setting�

• Set the camera to Auto Exposure Bracketing (AEB)

• If possible, use the camera’s self-timer setting, a cable release

or a wireless shutter release to minimize camera shake�

• Set the exposure increment to +/- 2 for optimal exposure range�

If your camera does not oer +/- 2 exposure increments, select

the maximum possible� Consult the camera manual for model-

specic instructions for choosing this setting�

1.2 Selecting the Exposures

To get good results with HDR processing, your bracketed

sequence must include photos that correctly expose highlights

as well as photos that correctly expose shadows� The latter is especially

important to prevent noise

in the processed HDR image�

In the lightest photo of the sequence, the darkest shadow areas of the scene should be shifted at least

into the mid-tones� To check this, use your camera’s histogram preview in playback mode� In your most

overexposed photo, the left part of the histogram should be empty until 1/3rd of the histogram’s width� If

this is not the case, add one or more photos taken with longer exposure times� Another option is to re-shoot

the exposure sequence with the normal exposure set one or more EVs higher if your most underexposed

image in the exposure sequence was too dark� This is the case when the histogram of your darkest image is

completely empty on the right half�

The number of exposures needed depends on the dynamic range of the scene, in addition to the exposure

increment� For most outdoor scenes, three exposures taken at +/- 2 exposure increments is sucient,

provided the scene does not include the sun� However, for the interior of a room with a bright view out the

window, you will need at least ve images taken with an exposure increment of +/- 2, or nine images taken

with an exposure increment of +/- 1�

In scenes with extreme dierences between light and dark details, you should change the exposures

manually to ensure you capture a wide enough range to cover your scene�

The continuous shooting mode may not

always be the best strategy because camera

shake may build up. It is recommended to

use a method that ensures the least possible

shake for each single shot, such as mirror

lock-up functionality, if available.

AEB settings on a Nikon D7000

(3 frames, at +/- 2 EV)

Canon Rebel T2i/550D LCD showing

AEB with +/-2 EV increments selected

Note

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