Essential Books

Image Cropping and Resizing

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If you have an image and want to create a new image, with new dimensions, you can use imagecopyresampled function:

first create a new image with desired dimensions: 

// new image
$dst_img = imagecreatetruecolor($width, $height);

and store the original image into a variable. To do so, you may use one of the createimagefrom* functions where * stands for:

For example: 

//original image
$src_img=imagecreatefromstring(file_get_contents($original_image_path));

Now, copy all (or part of) original image (src_img) into the new image (dst_img) by imagecopyresampled: 

imagecopyresampled($dst_img, $src_img, 
    $dst_x ,$dst_y, $src_x, $src_y, 
    $dst_width, $dst_height, $src_width, $src_height);

To set src_* and dst_* dimensions, use the below image:

Now, if you want to copy entire of source (initial) image, into entire of destination area (no cropping): 

$src_x = $src_y = $dst_x = $dst_y = 0;
$dst_width = $width;// width of new image
$dst_height = $height; //height of new image
$src_width = imagesx($src_img); //width of initial image
$src_height = imagesy($src_img); //height of initial image
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Image processing with GD:
* Image Processing with GD
* Image output
* Creating an image
* Image Cropping and Resizing
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