php - 寸法がわかっている場合は画像をトリミングします

Question

画像と、画像をトリミングするために必要なすべての寸法があります。ソース パスから画像を選択し、その画像を宛先パスに保存したいです。画像をトリミングして保存するために PHP のどの関数を使用する必要があるかを知りたいです。

Answer 1

次のコードは作業を行います

/**
 * Php function to crop an image
 * 
 * @param string $source_image Path of the source image
 * @param string $target_image Path of the target image
 * @param array $crop_area Array like array('left' => [LEFT], 'top' => [TOP],
 *                                          'width' => [WIDTH], => 'height' => [HEIGHT]) 
 */
function cropImage($source_image, $target_image, $crop_area)
{
    // detect source image type from extension
    $source_file_name = basename($source_image);
    $source_image_type = substr($source_file_name, -3, 3);

    // create an image resource from the source image  
    switch(strtolower($source_image_type))
    {
        case 'jpg':
            $original_image = imagecreatefromjpeg($source_image);
            break;

        case 'gif':
            $original_image = imagecreatefromgif($source_image);
            break;

        case 'png':
            $original_image = imagecreatefrompng($source_image);
            break;    

        default:
            trigger_error('cropImage(): Invalid source image type', E_USER_ERROR);
            return false;
    }

    // create a blank image having the same width and height as the crop area
    // this will be our cropped image
    $cropped_image = imagecreatetruecolor($crop_area['width'], $crop_area['height']);

    // copy the crop area from the source image to the blank image created above
    imagecopy($cropped_image, $original_image, 0, 0, $crop_area['left'], $crop_area['top'], 
              $crop_area['width'], $crop_area['height']);

    // detect target image type from extension
    $target_file_name = basename($target_image);
    $target_image_type = substr($target_file_name, -3, 3);

    // save the cropped image to disk
    switch(strtolower($target_image_type))
    {
        case 'jpg':
            imagejpeg($cropped_image, $target_image, 100);
            break;

        case 'gif':
            imagegif($cropped_image, $target_image);
            break;

        case 'png':
            imagepng($cropped_image, $target_image, 0);
            break;    

        default:
            trigger_error('cropImage(): Invalid target image type', E_USER_ERROR);
            imagedestroy($cropped_image);
            imagedestroy($original_image);
            return false;
    }

    // free resources
    imagedestroy($cropped_image);
    imagedestroy($original_image);

    return true;
}


// using the function to crop an image
$source_image = 'image.jpg';
$target_image = 'cropped_image.jpg';
$crop_area = array('top' => 100, 'left' => 100, 'height' => 300, 'width' => 300);

cropImage($source_image, $target_image, $crop_area);

またはこれを見る