public String evaluate(String red, String green, String blue) throws Exception {
            driver.findElement(By.name("RedIn")).clear();
            driver.findElement(By.name("RedIn")).sendKeys(red);

            driver.findElement(By.name("GreenIn")).clear();
            driver.findElement(By.name("GreenIn")).sendKeys(green);

            driver.findElement(By.name("BlueIn")).clear();
            driver.findElement(By.name("BlueIn")).sendKeys(blue);
            driver.findElement(By.xpath("//div[@id='content']/div[2]/table/tbody/tr[5]/td[4]/input")).click();
            return driver.findElement(By.name("HexOut")).getAttribute("value");
     }