Magento 2 : CAPTCHA image display too much dots

Question

I'm new in magento. I am working in custom module.

I apply captcha in registration page and login page. But, there are too much dots and lines display in image. Sometimes, I can't read text properly.

I checked in admin configuration. But, I didn't found any configuration to decrease dots and lines from CAPTCHA.

How to do manage this?

please help me to solve this issue.

Thanks.

Answer 1

Go to :

/vendor/magento/zendframework1/library/Zend/Captcha/Image.php

Open this file and go to line no 121 and 129.

Find this below line :

protected $_dotNoiseLevel = 100; // For dots
protected $_lineNoiseLevel = 5; // For lines

And replace it :

protected $_dotNoiseLevel = 50;
protected $_lineNoiseLevel = 3;

Save it and clean cache.

Answer 2

Tested in Magento 2.2
The DotNoiseLevel and LineNoiseLevel are set in vendor\zendframework\zend-captcha\src\Image.php You can override Magento\Captcha\Model\DefaultModel and set DotNoiseLevel and LineNoiseLevel as class DefaultModel extends \Zend\Captcha\Image

Your Custom module di.xml will be

<preference for="Magento\Captcha\Model\DefaultModel" type="Custom\Captcha\Model\DefaultModel"/>

and model class will be Custom\Captcha\Model\DefaultModel.php

public function __construct(
    \Magento\Framework\Session\SessionManagerInterface $session,
    \Magento\Captcha\Helper\Data $captchaData,
    \Magento\Captcha\Model\ResourceModel\LogFactory $resLogFactory,
    $formId
) {
    parent::__construct($session,$captchaData,$resLogFactory,$formId);
    $this->setDotNoiseLevel(2);
    $this->setLineNoiseLevel(1);
}

Answer 3

/vendor/magento/zendframework1/library/Zend/Captcha/Image.php (nothing will happen after change so go below path)

/vendor/zendframework/zend-captcha/src/Image.php

Open this file and go to line no 106 and 114.

Find this below line :

protected $_dotNoiseLevel = 100; // For dots protected $_lineNoiseLevel = 5; // For lines And replace it :

protected $_dotNoiseLevel = 0; protected $_lineNoiseLevel = 0;