问用PHP和TCPDF降低PDF文件中图像的分辨率

EN

compressedImage($source, $path, $quality); //before create pdf

// Compress image function
function compressedImage($source, $path, $quality) {

            $info = getimagesize($source);

            if ($info['mime'] == 'image/jpeg'){
                $image = imagecreatefromjpeg($source);

            }elseif ($info['mime'] == 'image/gif'){
                $image = imagecreatefromgif($source);

            }elseif ($info['mime'] == 'image/png'){ 
                $image = imagecreatefrompng($source);
            }

            imagejpeg($image, $path, $quality);
            return $path;

    }

public  
setJPEGQuality( $quality )
//------------------//
SetCompression( $compress = true )
Activates or deactivates page compression. When activated, the internal representation of each page is compressed, which leads to a compression ratio of about 2 for the resulting document. Compression is on by default. Note: the Zlib extension is required for this feature. If not present, compression will be turned off.

Image( $file, $x = '', $y = '', $w = 0, $h = 0, $type = '', $link = '', $align = '', $resize = false, $dpi = 300, $palign = '', $ismask = false, $imgmask = false, $border = 0, $fitbox = false, $hidden = false, $fitonpage = false, $alt = false, $altimgs = array() )