HDR Soft Pro - 3.2 - Macintosh Manual de usuario descargar pdf (Pagina 7)

Section 1: Taking photos for HDR

Photomatix Pro User Manual Page

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1.2 Selecting the exposures

To get good results with HDR processing, your capture sequence must include photos that

correctly expose highlights and photos that correctly expose shadows. The latter is especially

important to avoid noise showing in the processed HDR image.

In the lightest photo of the sequence, the darkest shadows should be at least in the mid-tones.

You can check that with your camera’s histogram preview in playback mode. In your most

overexposed photo, the left part of the histogram should be empty until 1/3

of the histogram’s

width. If this is not the case, you will have to 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 will be sufficient, 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 five images taken with

an exposure increment of +/- 2, or nine images taken with an exposure increment of +/- 1.

In scenes with extreme differences between light and dark details, you should change the

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

1.3 Taking photos for HDR with film-based cameras

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Follow the camera setup listed at the top of subsection 1.1 and the tips on selecting

exposures in subsection 1.2. Keep in mind that you will not have the option of previewing

the live histogram to determine your exposure range.



Scan film or slides, not prints. Photo labs will attempt to make the best print from each of

your source images, and you will not achieve good results scanning these for HDR

generation.



Turn off your scanner’s auto-exposure options. This allows you to manually control the

exposure.



Make sure you select the “Align images” option in Photomatix Pro when combining your

images.

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HDR Soft Pro - 3.2 - Macintosh Manual de usuario Pagina 7