Adjusting an image: Adding the Levels Layer and Hue/Saturation Layer

1. From the Layers menu, select New Adjustment layer>Levels.
2. In the New Layer dialog, click OK.
3. Adjust the input levels.

3.  Click OK.

4. To colorize the image: from the Layers menu, select New Adjustment layer>Hue/Saturation.

5. In the New Layer dialog, click OK.

6. Enable the Colorize checkbox.

7. Adjust the Hue and Saturation values.

The result:

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