<?php $image = imagecreatefromjpeg('/path/to/picture.jpg'); $matrix = array(array(-1, -1, -1), array(-1, 20, -1), array(-1, -1, -1)); $divisor = array_sum(array_map('array_sum', $matrix)); imageconvolution($image, $matrix, $divisor, 0); echo imagecolorat($image, 0, 0);
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