Remove Image background with php and save transparent png

Question

I want to remove the white background of any image uploaded on the site working on PHP platform. The uploading function is done but messed up with this functionality.

Here is the link I found here: Remove white background from an image and make it transparent

But this is doing reverse. I want to remove the colored background and make it image with transparent background.

Answer 1

Since you only need single-color transparency, the easiest way is to define white with imagecolortransparent(). Something like this (untested code):

$img = imagecreatefromstring($your_image); //or whatever loading function you need
$white = imagecolorallocate($img, 255, 255, 255);
imagecolortransparent($img, $white);
imagepng($img, $output_file_name);