Adobe Photoshop CC 2014 v.14.xx - Manual (Page 433)

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Exposure And Gamma
Highlight Compression
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In the upper-right corner of the Merge to HDR Pro dialog box, click the response curve menu , and then choose Save Response Curve.
(To later reapply the curve, choose Load Response Curve.)
Convert from 32 bits to 16 or 8 bpc
If you originally created a 32-bit image during the Merge to HDR Pro process, you can later convert it to a 16- or 8-bit image.
1. Open a 32-bpc image in Photoshop, and choose Image > Mode > 16 Bits/Channel or 8 Bits/Channel.
2. Adjust exposure and contrast to produce an image with the dynamic range you want. (See Options for 16- or 8-bit images .)
3. Click OK to convert the 32-bit image.
Adjust displayed dynamic range for 32-bit 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 panel, click the Eyedropper icon in the Info panel 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:
Adjusts the brightness and contrast.
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. If you chose Exposure And Gamma, move the Exposure and Gamma sliders to adjust the brightness and contrast 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.
About the HDR Color Picker
The HDR Color Picker allows you to accurately view and select colors for use in 32-bit HDR images. As in the regular Adobe Color Picker, you
select a color by clicking a color field and adjusting the color slider. The Intensity slider allows you to adjust the brightness of a color to match the
intensity of the colors in the HDR image you’re working with. A Preview area lets you view swatches of a selected color to see how it will display at
different exposures and intensities.
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