Creating/Saving DirectDraw Surface (DDS) Image via Imagick - php

Question

This is the first time I use PHP Imagick and experiencing problems with it.
I'm creating a website module where users can upload images that need to be converted to an encrypted file type containing the uploaded image as a DDS texture.
So what I need to do is convert the uploaded image to dds file format.
Code:
$img = new Imagick('test.png'); //Load the uploaded image
$img->setformat('dds'); //Set the format to dds
$img->setImageCompression(Imagick::COMPRESSION_DXT3); //Set compression method
$img->writeimage('test.dds'); //Write/save the dds texture
The problem: the output file is always an empty, 0 byte file.
PNG That needs to be converted: test.png
DDS That needs to be the output: test.dds
Maybe I need other version Imagick or ImageMagick?
My old version of these are:
PHP 5.5.15
Imagick 3.1.2-5.5-ts-vc11-x86
ImageMagick 6.8.4-0-Q16-x86
I am currently testing on Windows 8.1 x64.
Any suggestion/help would be appreciated.
Edit: Edited the question, hopefully its clear now what I am trying to achieve.
Solved: The problem was the version of ImageMagick that had no support for DDS write.
Installed ImageMagick 6.8.6-10-Q16-x86 since the DDS write support was added in that version (newer versions caused the imagick not to be loaded).
Current version of what I use and works:
PHP 5.5.15
Imagick 3.1.2-5.5-ts-vc11-x86
ImageMagick 6.8.6-10-Q16-x86

Answer 1

From the debugging above the issue is that your version of ImageMagick doesn't support writing DXT3 compressed DDS files.
The options to solve this problem are:
Use a different compression format - DXT5 might be okay, but it's not exactly the same as DXT3.
Upgrade to a newer version of ImageMagick and Imagick that support writing in DXT3 format.