Select the image.

Choose View > Show Adjust Image.

Use the controls to make adjustments.

• Brightness:  
  Changes the amount of white in the image. Dragging to the right increases the white in the image, making it appear brighter.
• Contrast:  
  Changes the difference between the light and dark areas of the image. If you increase contrast, the light parts get lighter and the darks get darker. If you decrease contrast, the difference between light and dark decreases. Dragging to the right makes the edges between light and dark areas more stark, and can make a photo appear more like an illustration.
• Saturation:  
  Changes the richness of color in the image. Dragging to the right makes the colors richer or more vibrant.
• Temperature:  
  Changes the warmth or coolness of the image by adjusting the amount of warm tones (red) or cold tones (blue).
• Tint:  
  Changes the overall color cast of the image by adjusting the amount of red or green tones.
• Sharpness:  
  Sharpens or softens (blurs) the focus of the image.
• Exposure:  
  Changes the overall lightness or darkness of the entire image. When you adjust exposure, every part of the image gets lighter or darker. Increasing the exposure of an image can also reduce its color.
• Histogram and Levels:  
  Describes the total color information in the image, from the darkest shadow on the left, to the brightest highlight on the right. The heights of the peaks tell you how much color information falls in a given range.

  To set the dark level, drag the left slider toward the middle. Dragging the slider to the right narrows the range of color and can bring more clarity to the shadows. The position of the slider determines how much information is in the darkest part of the image; any information to the left of the slider is omitted from the image. You may want to drag the slider just to the point that the histogram line shows a noticeable bump, signifying that detail is available.

  To set the light level, drag the right slider toward the middle. Dragging the slider to the left narrows the range of color and can bring more clarity to the highlights. The position of the slider determines how much information is in the lightest part of the image; any information to the right of the slider is omitted from the image. You may want to drag the slider just to the point that the histogram line shows a noticeable bump, signifying that detail is available.

• Enhance:  
  Automatically adjusts the image by spreading the red, green, and blue tones evenly across the histogram.

To restore the original settings, click Reset Image.

To save any changes you made, save the document. The settings at the time you save the document are visible anytime you open the Adjust Image window.