Adobe Photoshop CS3 Manual de usuario descargar pdf (Pagina 180)

PHOTOSHOP CS3

User Guide

173

Image pixels don’t extend to the ends of the graph, indicating that the image is not using the full tonal range.

A. Shadow Input slider B. Highlight Input slider

Iftheimageusesthefulltonalrange,butneedsmidtonecontrast,chooseImage>Adjustments>Curves.Dragthe

curve into an S shape.

Increasing the slope in the middle of the curve increases contrast in the midtones.

See also

“About adjustment layers and fill layers” on page 306

Adjust Exposure for HDR images

The Exposure dialog box is designed for making tonal adjustments to HDR images, but it works with 8-bit and 16-bit

images. Exposure works by performing calculations in a linear color space (gamma 1.0) rather than the image’s

current color space.

1 Choose Image > Adjustments > Exposure.

2 Set any of the following options:

Exposure Adjusts the highlight end of the tonal scale with minimal effect in the extreme shadows.

Offset Darkens the shadows and midtones with minimal affect on the highlights.

Gamma Adjusts the image gamma, using a simple power function. Negative values are mirrored around zero (that

is, they remain negative but still get adjusted as if they were positive).

The eyedroppers adjust the image’s luminance values (unlike the Levels eyedroppers that affect all color channels).

• The Set Black Point eyedropper sets the Offset, shifting the pixel you click to zero.

• The Set White Point eyedropper sets the Exposure, shifting the point you click to white (1.0 for HDR images).

• The Midtone eyedropper sets the Exposure, making the value you click middle gray.

See also

“About high dynamic range images” on page 77

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