Apple MB673Z/A User Manual - Page 352
Using the Boost Controls, To adjust the Boost parameters
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Using the Boost Controls The Mac OS characterizes each digital camera's RAW file format to determine an optimal contrast setting. The Boost controls allow you to set the strength of the contrast when the RAW file is decoded. The Hue Boost controls are used to maintain the hues in the image as the contrast is increased using the Boost controls. When the Hue Boost parameter is set to 1.00 and the Boost parameter is set to 1.00, the hues of the primary and secondary colors are pinned to their pure color values, resulting in a shift of all the hues in the image. For images that consist of saturated primary and secondary colors, such as an image of flowers in a lush garden, shifting the hues to their true values has a desirable visual effect. However, this is not visually desirable for images containing skin tones. Shifting the hues most often causes the skin to appear yellow. Setting the Hue Boost parameter to 0.00 increases the color contrast in the image while preserving the original hues in the image. To adjust the Boost parameters: 1 Select a RAW image imported with or migrated to Aperture 2.0 or later. The version is indicated by the RAW Decode Version pop-up menu. 2 In the Adjustments inspector or the Adjustments pane of the Inspector HUD, adjust the Boost parameter by doing one of the following: Use the Boost slider and value slider to adjust the amount of contrast applied during the RAW decoding process. Â By default, the Boost slider is set to 1.00. Drag the Boost slider to the left to decrease the amount of contrast applied to the image during the RAW decoding process, and drag the Boost slider back to the right to increase it. Â Click the left or right arrow in the Boost value slider to adjust the contrast by 5 percent increments, or drag in the value field. Â Double-click the number in the Boost value slider, then enter a value from 0.00 to 1.00 and press Return. A value of 0.00 applies no contrast adjustment to the image during the RAW decoding process. A value greater than 0.00 increases the contrast adjustment to the image. A value of 1.00 applies the full Apple-recommended contrast adjustment for the specific camera model. 352 Part III Performing Image Adjustments
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