code: public void setWatermarks(java.util.Collection<PresetWatermark> watermarks) {
          if (watermarks == null) {
              this.watermarks = null;
              return;
          }
  
          this.watermarks = new com.amazonaws.internal.SdkInternalList<PresetWatermark>(watermarks);
      }
docs: <p>
  Settings for the size, location, and opacity of graphics that you want Elastic Transcoder to overlay over videos
  that are transcoded using this preset. You can specify settings for up to four watermarks. Watermarks appear in
  the specified size and location, and with the specified opacity for the duration of the transcoded video.
  </p>
  <p>
  Watermarks can be in .png or .jpg format. If you want to display a watermark that is not rectangular, use the
  .png format, which supports transparency.
  </p>
  <p>
  When you create a job that uses this preset, you specify the .png or .jpg graphics that you want Elastic
  Transcoder to include in the transcoded videos. You can specify fewer graphics in the job than you specify
  watermark settings in the preset, which allows you to use the same preset for up to four watermarks that have
  different dimensions.
  </p>
  
  @param watermarks
  Settings for the size, location, and opacity of graphics that you want Elastic Transcoder to overlay over
  videos that are transcoded using this preset. You can specify settings for up to four watermarks.
  Watermarks appear in the specified size and location, and with the specified opacity for the duration of
  the transcoded video.</p>
  <p>
  Watermarks can be in .png or .jpg format. If you want to display a watermark that is not rectangular, use
  the .png format, which supports transparency.
  </p>
  <p>
  When you create a job that uses this preset, you specify the .png or .jpg graphics that you want Elastic
  Transcoder to include in the transcoded videos. You can specify fewer graphics in the job than you specify
  watermark settings in the preset, which allows you to use the same preset for up to four watermarks that
  have different dimensions.