mPDF 5.7.1 - image displays as a broken [x]

Question

I have a small issue with mPDF (version 5.7.1).

This code should generate PDF with image file:

 $mpdf = new mPDF();
 $html = \'

        

Answer 1

I had the same problem with PNG images being displayed as [X] when to generate PDFs with mPDF.

I added: $mpdf->showImageErrors = true;

After: $mpdf = new Mpdf();

and got the error message:

GD library required for PNG image (alpha channel)#

So after running apt-get install php5-gd generating a PDF with a PNG worked like a charm!