Question

how can I do this? I have an image 50x50 and I would like to generate one with 100x100, where the original 50x50 will be centered inside of that one. The rest would be filled with "transparent". Thanks

Answer 1

这是你如何做的:

$old = imagecreatefromjpeg("old_image.jpg"); 
// Create a 100x100 image
$im = imagecreatetruecolor(100, 100);
$black = imagecolorallocate($im, 0, 0, 0);

// Make the background transparent
imagecolortransparent($im, $black);

// Copy old image on top of new image
imagecopy($im, $old, 25, 25, 0, 0, 50, 50); 

// Save the image
imagepng($im,  ./new_image.png );
imagedestroy($im);

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