PHP-如何将JPEG图像保存为渐进JPEG？

我具有以下将JPEG保存为渐进JPEG的功能.它已保存,但不是渐进式JPEG.这个对吗 ？

function save($filename, $image_type = IMAGETYPE_JPEG, $compression = 75, $permissions = null) {

    if ($image_type == IMAGETYPE_JPEG) {

        imageinterlace($this->image, true); //convert to progressive ?
        imagejpeg($this->image, $filename, $compression);

    } elseif ($image_type == IMAGETYPE_GIF) {

        imagegif($this->image, $filename);

    } elseif ($image_type == IMAGETYPE_PNG) {

        imagepng($this->image, $filename);
    }

    if ($permissions != null) {

        chmod($filename, $permissions);
    }
}

这就是我所谓的save()函数的方式：

function img_reconstruct($saveto) {
  $image = new SimpleImage();

  $image->load($saveto);

  list($width, $height) = getimagesize($saveto);

  if ($width > 800 && $width < 1200) {

    $image->resize(800, $height);

    $image->save($saveto);

  }
 }

解决方法:

尝试如下

imageinterlace($this->image, 1); //convert to progressive ?

类型转换可能有问题

标签：image,jpeg,php,progressive
来源： https://codeday.me/bug/20191101/1984698.html