Apple MB673Z/A User Manual - Page 410

Important: Make sure that there is as little digital noise in the target area of the Loupe as possible. Digital noise can skew the white-balance calculation results, introducing a color cast that wasn't previously there. A simple way to avoid errant pixels is to increase the magnification of the Loupe by pressing Command-Shift-Plus Sign (+). Adjusting the Color Temperature of the Image with the Temp Controls You can also adjust the color temperature of an image manually using the Temp parameter controls. Color temperature is a term used to describe the color of light when the image was shot. However, it refers to the color value of the light rather than its heat value. Light's color temperature is measured in units called kelvin (K). Adjusting the color temperature of the image changes how Aperture interprets the colors in the image in relation to the assigned temperature of light. The purpose of adjusting the color temperature of an image is to make colors look as natural as possible. To manually adjust the color temperature of an image: 1 Select an image. 2 In the White Balance area of the Adjustments inspector or the Adjustments pane of the Inspector HUD, adjust the Temp parameter by doing one of the following: Use the Temp slider and value slider to adjust the color temperature of the image. Â Drag the Temp slider to the left to cool the tonality of the image, or drag it to the right to warm the tonality. Â Click the left or right arrow in the Temp value slider to change the brightness of the image by 10 K increments, or drag in the value field. The left arrow decreases the color temperature of the image, and the right arrow increases the color temperature. Â Double-click the number in the Temp value slider, then enter a value from 2000 K to 50,000 K and press Return. The color temperature of the image updates as you change the parameter value. 410 Part III Performing Image Adjustments