(PECL imagick 2 >= 2.3.0, PECL imagick 3 >= 3.3.0)
Imagick::deskewImage — Removes skew from the image
This method can be used to remove skew from for example scanned images where the paper was not properly placed on the scanning surface. Questo metodo è disponibile se Imagick è stato compilato con ImageMagick versione 6.4.5 o successive.
thresholdDeskew threshold
Example #1 Imagick::deskewImage()
<?php
function deskewImage($threshold) {
$imagick = new \Imagick(realpath("images/NYTimes-Page1-11-11-1918.jpg"));
$deskewImagick = clone $imagick;
//This is the only thing required for deskewing.
$deskewImagick->deskewImage($threshold);
//The rest of this example is to make the result obvious - because
//otherwise the result is not obvious.
$trim = 9;
$deskewImagick->cropImage($deskewImagick->getImageWidth() - $trim, $deskewImagick->getImageHeight(), $trim, 0);
$imagick->cropImage($imagick->getImageWidth() - $trim, $imagick->getImageHeight(), $trim, 0);
$deskewImagick->resizeimage($deskewImagick->getImageWidth() / 2, $deskewImagick->getImageHeight() / 2, \Imagick::FILTER_LANCZOS, 1);
$imagick->resizeimage($imagick->getImageWidth() / 2, $imagick->getImageHeight() / 2, \Imagick::FILTER_LANCZOS, 1);
$newCanvas = new \Imagick();
$newCanvas->newimage($imagick->getImageWidth() + $deskewImagick->getImageWidth() + 20, $imagick->getImageHeight(), 'red', 'jpg');
$newCanvas->compositeimage($imagick, \Imagick::COMPOSITE_COPY, 5, 0);
$newCanvas->compositeimage($deskewImagick, \Imagick::COMPOSITE_COPY, $imagick->getImageWidth() + 10, 0);
header("Content-Type: image/jpg");
echo $newCanvas->getImageBlob();
}
?>