php imagick - read image from base64 - php

Question

I am manipulating images with js, and I'd like to save these transformed images. I'm posting this data with ajax:
image : canvas.toDataURL('image/jpeg')
This way, I get the base64 code for the image, but I can't find a way to read it with Imagick.
This is my process:
$img = new Imagick();
$decoded = base64_decode($_POST['image']);
$img->readimageblob($decoded);
But this fails:
Fatal error: Uncaught exception 'ImagickException' with message 'no decode delegate for this image format `' # error/blob.c/BlobToImage/360' in /Library/WebServer/Documents/test/save.php:7
Stack trace:
#0 /Library/WebServer/Documents/test/save.php(7): Imagick->readimageblob('u?Z?f?{??z?????...')
Any ideas why?

Answer 1

Figured out.
I had to remove the data:image/png;base64, part from the posted string, and then imagick could interpret it as blob.

Answer 2

readImageBlob — Reads image from a binary string : http://php.net/manual/en/imagick.readimageblob.php
$base64 = "iVBORw0KGgoAAAAN....";
$imageBlob = base64_decode($base64);
$imagick = new Imagick();
$imagick->readImageBlob($imageBlob);
header("Content-Type: image/png");
echo $imagick;

Answer 3

Read this url;--
PHP-Imagemagick image display
or try it:-
$thumbnail = $img->getImageBlob();
$contents = ob_get_contents();
ob_end_clean();
echo "<img src='data:image/jpg;base64,".base64_encode($contents)."' />";