将ImageMagick命令转换为PHP等效项

convert input.jpg -resize 800x600 output.jpg

$srcImage = imagecreatefromjpeg('input.jpg');
$dstImage = imagecreatetruecolor(800, 600);
imagecopyresampled($dstImage, $srcImage, 0, 0, 0, 0, 800, 600, imagesx($srcImage), imagesy($srcImage));
imagejpeg($dstImage, 'output.jpg');
imagedestroy($srcImage);
imagedestroy($dstImage);

$image = new Imagick('input.jpg');
$image->resizeImage(800, 600, Imagick::FILTER_LANCZOS, 1);
$image->writeImage('output.jpg');
$image->destroy();

convert input.jpg -gravity southeast -pointsize 20 -draw "text 10,10 'Watermark'" output.jpg

$srcImage = imagecreatefromjpeg('input.jpg');
$color = imagecolorallocate($srcImage, 255, 255, 255);
imagettftext($srcImage, 20, 0, imagesx($srcImage) - 100, imagesy($srcImage) - 30, $color, 'font.ttf', 'Watermark');
imagejpeg($srcImage, 'output.jpg');
imagedestroy($srcImage);

$image = new Imagick('input.jpg');
$draw = new ImagickDraw();
$draw->setFillColor('white');
$draw->setFont('font.ttf');
$draw->setFontSize(20);
$image->annotateImage($draw, imagesx($image) - 100, imagesy($image) - 30, 0, 'Watermark');
$image->writeImage('output.jpg');
$image->destroy();