Unable to use WordPress header crop

Tried to add a header image to the blog. ┬áThe image upload function worked fine but after the image was uploaded, WordPress asked to crop the image. Clicking on ‘Crop and Publish’ gives the error:

Image could not be processed. Please go back and try again.

Turns out you need an image manipulation tool called ‘gd’ to make WordPress header crop work. It is a module of php. Installation of gd:

# yum install php-gd

Had to restart apache and now header crop works!

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