Canon EOS 40D Service Manual page 206

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Appendix
(4) Adjusting the gamma characteristics
You can adjust the gamma characteristics of an image using the tone curve.
By creating up to 10 adjustment points anywhere along the tone curve, you can freely
adjust the brightness and contrast.
And the results of your adjustments are applied to the sample image in the main window
in real time.
Fig. 015 Adjusting the gamma characteristics
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