code: public CdnPathBuilder sharp(int strength) {
          if (strength < 0 || strength > 20) {
              strength = 5;
          }
          sb.append("/-/sharp/")
                  .append(strength);
          return this;
      }
docs: Performs sharpening on result image. This can be useful after scaling down.
  
  @param strength Strength can be from 0 to 20. Default is 5.