Convert JPEG to a Progressive JPEG in PHP

Question

I\'m trying to re-save an already created JPEG as a progressive jpg.

Basically, on the front end I have some JS that crops an image, and outputs a base64 im

Answer 1

Try Imagick (ImageMagic Package) as shown in here : http://php.net/manual/en/imagick.setinterlacescheme.php

$image = new Imagick('image.jpg');

$image->thumbnailImage(500, 0);

$image->setInterlaceScheme(Imagick::INTERLACE_PLANE);

$image->writeImage('progressive.jpg');

Answer 2

Use imageinterlace.

$src_img = imagecreatefromjpeg('source.jpg');

imageinterlace($src_img, true);

imagejpeg($src_img, 'destination.jpg');

imagedestroy($src_img);

Answer 3

Create image resource with imagecreatefromstring:

$data = base64_decode($data);
$im = imagecreatefromstring($data);
if ($im === false) {
  die("imagecreatefromstring failed");
}
imageinterlace($im, true);
imagejpeg($im, 'new.jpg');
imagedestroy($im);