Photoshop

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White balance controls in Camera Raw

In very simple terms, adjusting the white balance is a matter of identifying what objects in the image should be neutral-colored (white or gray) and then adjusting the colors in the image to make those objects neutral-colored. A white or gray object in a scene takes on the color cast by the ambient light or flash used to shoot the picture. When you use the White Balance tool to specify an object that should be white or gray, Camera Raw can determine the color of the light in which the scene was shot and then adjust for scene lighting automatically.

Color temperature (in Kelvins) is used as a measure of scene lighting because natural and incandescent light sources give off light in a predictable distribution according to their temperature.

A digital camera records the white balance at the time of exposure as a metadata entry. The Camera Raw plug‑in reads this value and makes it the initial setting when you open the file in the Camera Raw dialog box. This setting usually yields the correct color temperature, or nearly so. You can adjust the white balance if it is not quite right.
Note: Not all color casts are a result of incorrect white balance. Use the controls in the Calibrate tab to correct a color cast that remains after the white balance is adjusted.

The Basic tab in the Camera Raw dialog box has three controls for correcting a color cast in an image:

White Balance
Camera Raw applies the white balance setting and changes the Temperature and Tint properties in the Basic tab accordingly. Use these controls to fine-tune the color balance.
As Shot
Uses the camera’s white balance settings, if they are available.

Auto
Calculates the white balance based on the image data.

Note: If Camera Raw doesn’t recognize the white balance setting of a camera, choosing As Shot is the same as choosing Auto.

Temperature
Sets the white balance to a custom color temperature. Decrease Temperature to correct a photo taken with a lower color temperature of light; the Camera Raw plug‑in makes the image colors bluer to compensate for the lower color temperature (yellowish) of the ambient light. Conversely, increase Temperature to correct a photo taken with a higher color temperature of light; the image colors become warmer (yellowish) to compensate for the higher color temperature (bluish) of the ambient light.
Note: The range and units for the Temperature and Tint controls are different when you are adjusting a non-camera raw image, such as a TIFF or JPEG image.
Correcting the white balance

A.
Moving the Temperature slider to the right corrects a photo taken with a higher color temperature of light

B.
Moving the Temperature slider to the left corrects a photo taken with a lower color temperature of light

C.
Photo after color temperature adjustment

Tint
Sets the white balance to compensate for a green or magenta tint. Decrease Tint to add green to the image; increase Tint to add magenta.
To adjust the white balance quickly, select the White Balance tool , and then click an area in the preview image that should be a neutral gray or white. The Temperature and Tint properties adjust to make the selected color exactly neutral (if possible). If you’re clicking whites, choose a highlight area that contains significant white detail rather than a specular highlight. You can double-click the White Balance button to reset White Balance to As Shot.