Why does Imagemagick mess up image quality after resizing?

Question

PHP

I resize the image with the following parameters

$image = new Imagick($uploadfile);
$image->setImageCompressionQuality(100);
$image->setImageCompression(0);
$image->adaptiveResizeImage(320, 300, true);
$image->writeImage($direcrotyfile.'_320.jpg');

it turns out like this, the image loses quality


here is the quality of photoshop


here is the original image

Answer 1

It looks like adaptiveResizeImage doesn't contain the applied filter setting and uses the simplest one. Try using resizeImage with the FILTER_LANCZOS filter or something else (you can try to find a filter that gives the best result).

Answer 2

Moreover, even Photoshop does it! Try something in good quality and large size greatly reduced. Work with vector....