Is your feature request related to a problem? Please describe

I'm using Magick.net to update Exif metadata, but could not find a way, to replace the thumbnail image.

Describe the solution you'd like

I would like to be able to replace the thumbnail, by using magick.net

Describe alternatives you've considered

I have tried to make an extension method but did not find a way to

Server is down with 503 error when loading big pdf(8Mb, 40 pages).
It's because you puting file in construct method Imagick.

$this->imagick = new Imagick($pdfFile);

But why whole file if i need only one page. In method getImageData there is instruction that page is need use for generate preview.

$this->imagick->readImage(sprintf('%s[%s]', $this->pdfFile, $this->page - 1));

If you

closes #346