Getting "imagepng function not detected in php" Error

Posted May 12, 2014 5.5k views
I have used 'Fast secure contact from' plugin on my blog. When someone is trying to fill the form it is displaying.. 1. error si-captcha.php plugin says imagepng function not detected in php 2. error si-captcha.php plugin says gd image support function not detected in php How to install these functions in php?

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Try this on Debian/Ubuntu:

sudo apt-get install php5-gd