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GetSimple uses Jcrop as its image editor of choice.
GetSimple 3.0 has a bug with Jcrop: when cropping images larger than the image preview panel, the crop is erroneous.
That is fixed by adding line:
trueSize: [<?php print("$imgwidth,$imgheight"); ?>],
just below:
var api = $.Jcrop('#cropbox',{
in the file: image.php
In the file image.php, one can edit JCrop functions.
You can look up list of JCrop functions in the JCrop manual: http://deepliquid.com/content/Jcrop_Manual.html