Adobe Photoshop CS3 Bedienungsanleitung PDF herunterladen (Seite 89)

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PHOTOSHOP CS3

User Guide

2 In the HDR Conversion dialog box, choose a method for adjusting the brightness and contrast in the image:

Exposure And Gamma Lets you manually adjust the brightness and contrast of the HDR image.

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. No further adjustments are necessary; this method is automatic. Click OK to

convert the 32-bpc image.

Equalize Histogram Compresses the dynamic range of the HDR image while trying to preserve some contrast. No

further adjustments are necessary; this method is automatic. Click OK to convert the 32-bpc image.

Local Adaptation Adjusts the tonality in the HDR image by calculating the amount of correction necessary for local

brightness regions throughout the image.

3 (Optional) Click the arrow to display the toning curve and histogram. The histogram shows the luminance values

in the original HDR image. The red tick marks along the horizontal axis are in 1 EV (approximately 1 f-stop) incre-

ments. The toning curve is active only for the Local Adaptation method.

4 Do any of the following:

• If you chose Exposure And Gamma, move the Exposure slider to adjust the gain and move the Gamma slider to

adjust the contrast.

• If you chose Local Adaptation, move the Radius slider to specify the size of the local brightness regions. Move the

Thresholdslidertospecifyhowfaraparttwopixels’tonalvaluesmustbebeforethey’renolongerpartofthesame

brightness region. You can also use the toning curve to make adjustments.

Note: The toning curve usually lets you make limited changes from point to point and attempts to equalize your changes

across the points. If you select the Corner option after inserting a point on the curve, the limit is removed and no equal-

izationisperformedwhenyouinsertandmoveasecondpoint.You’llnoticethatthecurvebecomesangularatapoint

with the Corner option applied.

Toning curve adjustment using the Corner option

A. InsertingapointdisplaystheCorneroption. B. Adjusting new point makes the curve angular at the point where the Corner option is used.

5 (Optional) To save your 32-bit toning options as a file, click Save. Type a name for the file in the Save dialog box

and click Save.

You can reuse the saved 32-bit toning option file. Click Load to convert another 32-bpc image to an 8- or 16-bpc

image.

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