Magento 2 : CAPTCHA image display too much dots

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.

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