PNG to JPG is possible to change transparent background color?

[BodyEND]

Hi, i want to ask if is possible to change transparent background to white color, because now if i resize PNG to JPG, all transparent color is converted to black color. Thank you.

[BodyEND]

So to achieve that background transparency color change: i changed: public function fromFile($file)

to

case 'image/png':
      $this->image = imagecreatefrompng($file);

      $width = imagesx($this->image);
      $height = imagesy($this->image);
      $imageNew = imagecreatetruecolor($width, $height);
      imagefill($imageNew, 0, 0, imagecolorallocate($imageNew, 255, 255, 255));  // white background;
      imagecopyresampled($imageNew, $this->image, 0, 0, 0, 0, $width, $height, $width, $height);
      imagedestroy($this->image); 
      $this->image=$imageNew;

break;

it's not perfect solution, but is working. Can i achieve this with some build in function? Thank you for answer

[claviska]

This is untested, but something like this should do it.

$originalImage->fromFile($filename);

$newImage
  ->fromNew($originalImage->getWidth(), $originalImage->getHeight, $color)
  ->overlay($originalImage)
  ->toFile($newFilename, 'image/jpeg');

More info can be found in the readme: https://github.com/claviska/SimpleImage#api