Adobe Photoshop CS3 Manual de usuario descargar pdf (Pagina 88)

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PHOTOSHOP CS3

User Guide

• Vary the shutter speed to create different exposures. Changing the aperture changes the depth of field in each

exposure and can produce lower-quality results. Changing the ISO or aperture may also cause noise or vignetting

in the image.

• In general, don’t use your camera’s auto-bracket feature, because the exposure changes are usually too small.

• The exposure differences between the photos should be one or two EV (exposure value) steps apart (equivalent to

about one or two f-stops apart).

• Don’t vary the lighting; for instance, don’t use a flash in one exposure but not the next.

• Make sure that nothing is moving in the scene. Exposure Merge works only with differently exposed images of the

identical scene.

Adjust dynamic range view for HDR images

The dynamic range of HDR images exceeds the display capabilities of standard computer monitors. When you open

an HDR image in Photoshop, it can look very dark or washed out. Photoshop lets you adjust the preview so that the

monitor displays an HDR image whose highlights and shadows aren’t washed out or too dark. The preview settings

are stored in the HDR image file (PSD, PSB, and TIFF only) and are applied whenever the file is opened in

Photoshop. Preview adjustments don’t edit the HDR image file, all the HDR image information remains intact. Use

the Exposure adjustment (Image > Adjustments > Exposure) to make exposure edits to the 32-bpc HDR image.

To view 32-bit readouts in the Info palette, click the Eyedropper icon in the Info palette and choose 32-Bit from the

pop-up menu.

1 Open a 32-bpc HDR image in Photoshop, and choose View > 32-Bit Preview Options.

2 In the 32-bit Preview Options dialog box, choose an option from the Method menu:

Exposure And Gamma Adjusts the brightness and contrast.

Highlight Compression Compresses the highlight values in the HDR image so they fall within the luminance values

range of the 8- or 16-bpc image file.

3 IfyouchoseExposureAndGamma,movetheExposureandGammasliderstoadjustthebrightnessandcontrast

of the image preview.

4 Click OK.

You can also adjust the preview of an HDR image open in Photoshop by clicking the triangle in the status bar of the

document window and choosing 32-Bit Exposure from the pop-up menu. Move the slider to set the white point for

viewing the HDR image. Double-click the slider to return to the default exposure setting. Since the adjustment is made

per view, you can have the same HDR image open in multiple windows, each with a different preview adjustment.

Preview adjustments made with this method are not stored in the HDR image file.

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Adobe Photoshop CS3 Manual de usuario Pagina 88

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