PDF (adobe.com)

Adjust highlights, midtones, and shadows with Levels

  1. Select the bitmap image.

  2. Do one of the following:

    • In the Property inspector, click the Add Live Filters button, and then select Adjust Color > Levels from the Filters pop-up menu.

    • Select Filters > Adjust Color > Levels.

      Levels dialog box

      To view your changes in the workspace, select Preview in the dialog box. As you make changes, the image updates.
  3. In the Channel pop-up menu, select to apply changes to individual color channels (Red, Blue, or Green) or to all color channels (RGB).

  4. Drag the Input Levels sliders under the Histogram:

    • The right slider adjusts the highlights using values from 255 to 0.

    • The center slider adjusts the midtones using values from 10 to 0.

    • The left slider adjusts the shadows using values from 0 to 255.

      Note: The shadow value cannot be higher than the highlight value; the highlight value cannot be lower than the shadow value; and the midtones must fall between the shadow and highlight settings.
  5. Drag the Output Levels sliders to adjust the contrast values:

    • The right slider adjusts the highlights using values from 255 to 0.

    • The left slider adjusts the shadows using values from 0 to 255.