(PECL imagick 2, PECL imagick 3)
Imagick::contrastImage — Change the contrast of the image
public Imagick::contrastImage ( bool $sharpen ) : bool
Enhances the intensity differences between the lighter and darker elements of the image. Set sharpen to a value other than 0 to increase the image contrast otherwise the contrast is reduced.
sharpen
The sharpen value
Returns true
on success.
Throws ImagickException on error.
Example #1 Imagick::contrastImage()
<?php function contrastImage($imagePath, $contrastType) { $imagick = new \Imagick(realpath($imagePath)); if ($contrastType != 2) { $imagick->contrastImage($contrastType); } header("Content-Type: image/jpg"); echo $imagick->getImageBlob(); } ?>
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https://www.php.net/manual/en/imagick.contrastimage.php