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