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Step 9 - White Balance (optional)
This step allows you to adjust the white balance. This step is optional, but should not be used if you have already adjusted the color temperature or color bias setting on your display at the end of Step 6. Adjusting the white balance is a very subjective step with the goal being to alter the color temperature of white so that any color hue is removed from neutral values.
When you are ready to begin, press the "Adjust" button. If you have not completed the response measurement in the previous step, the button will be dimmed until you do so.
After you press the "Adjust" button, a screen with a spiral gray ramp will be presented and your display will temporarily be set to a target gamma of 2.2. If you intend to set the gamma of your final profile to a value other than 2.2, you can use the slider to adjust the gamma to that value. This value will then be used as the initial value for the next target response step, but you will still be able to override the value and set the target response to any value that you like.
Simply click the mouse anywhere on screen to change the white balance, or click and drag to see the changes in real-time. For most CRT and LCD displays, an acceptable white balance change occurs close to the center of the image. For displays such as projectors where the color temperature of the bulb produces very mediocre whites, an acceptable white balance change may occur near an edge of the screen.
The "Native" button will reset the white balance to its uncorrected value. The "Cancel" button will exit the adjustment without making changes. The "Done" button will exit the adjustment, saving the current setting.
White Balance Image
You can change the image used in the white balance step to any image file that is in a format supported by QuickTime. Pressing the "Image..." button will present a file open dialog to allow you to select an image file. This image file can also be selected from within the application preferences dialog box. The selected image will be scaled to fit the available space on-screen.
To revert the image to the built-in, default spiral gray ramp, open the preferences and press the "Use Default" button.
View Curves
The "View" button will open a full-screen window and plot the correction curves that are being applied to the display to make it produce the user's target response and white balance settings.
The curves illustrate:
The "Done" button will close the window.
Again, this plot reflects the changes that must be made to the source signal to make the display perform as the user expects. It is not a plot of the resulting behavior of the display. It is what must be done to the display signal to achieve the resulting behavior.