PDF (adobe.com)

Adjust the brightness and contrast of an image

You can adjust the contrast or brightness of an image. This affects the highlights, shadows, and midtones of an image. You typically adjust brightness and contrast to correct images that are too dark or too light.

Note: Changing an image this way affects only this instance of the image; it does not affect the original image source file.

  1. In your draft, select the image you want to adjust.

  2. Do one of the following:

    • Click the Brightness/Contrast button icon of the brightness/contrast button in the image editing toolbar.

    • Select Format > Edit Image > Adjust Brightness and Contrast.

    • Right-click (Windows) or Control-click (Mac OS) the image, and then select Edit Image > Adjust Brightness and Contrast.

    Note: These options are not available if you belong to a user role that the Contribute administrator has restricted from inline image editing. For more information, talk to your Contribute administrator or see Set page-editing and paragraph settings.

    The Brightness/Contrast dialog box appears.

  3. Drag the Brightness and Contrast sliders to adjust the settings.

    Values range from -100 to 100.

  4. Click OK.