php imagick convert PNG to jpg
Another way to convert transparent png to jpg, as mentioned in Imagick::flattenImages:
$im = new Imagick('image.png');$im->setImageBackgroundColor('white');$im->flattenImages(); // This does not do anything.$im = $im->flattenImages(); // Use this instead.$im->setImageFormat('jpg');$im->writeImage('image.jpg');As time moves on, flattenImages() has been deprecated.
Instead of the line above use:
$im->mergeImageLayers(Imagick::LAYERMETHOD_FLATTEN);
You can use setBackgroundColor to set the default background color to something else than black. The PNG transparency will be replaced by the background color when saving to JPG.
Edit: Use it like so:
$img->setBackgroundColor(new ImagickPixel('#FFFFFF'));