src/main/java/com/uploadcare/urls/CdnPathBuilder.java
public CdnPathBuilder blur(int strength) {
        if (strength < 0 || strength > 5000) {
            strength = 10;
        }
        sb.append("/-/blur/")
                .append(strength);
        return this;
    }
public CdnPathBuilder blur(int strength) {
        if (strength < 0 || strength > 5000) {
            strength = 10;
        }
        sb.append("/-/blur/")
                .append(strength);
        return this;
    }
Performs Gaussian blur on result image.

@param strength Strength is standard deviation (aka blur radius) multiplied by ten. Strength
can be up to 5000. Default is 10.