public ImageInterface::crop($x, $y, $width, $height = NULL)
Crops an image to a rectangle specified by the given dimensions.
int $x: The top left coordinate, in pixels, of the crop area (x axis value).
int $y: The top left coordinate, in pixels, of the crop area (y axis value).
int $width: The target width, in pixels.
int $height: The target height, in pixels.
bool TRUE on success, FALSE on failure.
public function crop($x, $y, $width, $height = NULL);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Image!ImageInterface.php/function/ImageInterface::crop/8.1.x