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crop visible part of image with dynamically width and height

I have a div with overflow:hidden and an image inside that div.Also I have some buttons for zoom in zoom out and for moving the image to all directions via change of margin.How do I crop only the visible part of the image and save it ? Is it possible to do it with only javascript?

You can't save an image with javascript. You should do it with PHP. http://www.php.net/manual/en/function.imagecrop.php

You can do it in combination with Jcrop.

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