src/main/java/com/uploadcare/urls/CdnPathBuilder.java
public CdnPathBuilder sharp(int strength) {
        if (strength < 0 || strength > 20) {
            strength = 5;
        }
        sb.append("/-/sharp/")
                .append(strength);
        return this;
    }
public CdnPathBuilder sharp(int strength) {
        if (strength < 0 || strength > 20) {
            strength = 5;
        }
        sb.append("/-/sharp/")
                .append(strength);
        return this;
    }
Performs sharpening on result image. This can be useful after scaling down.

@param strength Strength can be from 0 to 20. Default is 5.