Join the social network of Tech Nerds, increase skill rank, get work, manage projects...
 
  • PHP script for resize PNG image with transparent background

    • 0
    • 0
    • 0
    • 0
    • 0
    • 0
    • 0
    • 0
    • 7.49k
    Comment on it

    This article demonstrate a PHP script which can be used to resize PNG image with transparent background. With the script given below we can pass custom width and size for resized image. The script is given below:


    <?php
    $original_img = 'file_path';// uploads/user_21098764.png
    $new_img = 'path to save file';//uploads/thumb_user_21098764.png
    $width = 300;//width for new image
    $heigth = 200;//height for new image
    
    resize($width, $height, $new_img, $original_img);
    
    /*
     * Function creates a new image from original image with defined resolution
     */
    
    function resize($width = NULL, $height = NULL, $targetFile, $originalFile) {
    
    $img = imagecreatefrompng($originalFile);
    
    /*if custom values for width and height are not set, 
     *Calculate from image original width and height
     */
    if($width != NULL && $height != NULL){
        $newWidth = $width;
        $newHeight = $height;
    }else{
        $imgWidth = imagesx($img);//get width of original image
        $imgHeight = imagesy($img);
    
        $newWidth = intval($imgWidth / 4);
        $newHeight = intval($imgHeight /4);
    }
    
    $newImage = imagecreatetruecolor($newWidth, $newHeight);
    imagealphablending($newImage, false);
    imagesavealpha($newImage,true);
    $transparency = imagecolorallocatealpha($newImage, 255, 255, 255, 127);
    imagefilledrectangle($newImage, 0, 0, $newHeight, $newHeight, $transparency);
    imagecopyresampled($newImage, $img, 0, 0, 0, 0, $newWidth, $newHeight, $imgWidth, $imgHeight);
    
    imagepng($newImage,$targetFile);
    }
    ?>
    

    Note : The above script is using functions of GD library, So please first check your server configuration that GD library is installed or not.

 0 Comment(s)

Sign In
                           OR                           
                           OR                           
Register

Sign up using

                           OR                           
Forgot Password
Fill out the form below and instructions to reset your password will be emailed to you:
Reset Password
Fill out the form below and reset your password: