Override captcha library class in magento 2

It is not so complicated. First in composer.json file add this line in psr-0 node

"Zend_Captcha": "app/code/"

so it will look like that

"psr-0": {
   "": "app/code/",
   "Zend_Captcha": "app/code/"
},

Then create directory app/code/Zend/Captcha/ and place there your file Image.php that you want to override.

After that just run composer update.

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