/**
* Create preview image
*
* @param string $imagePath
* @return string
*/
public function createPreviewImage($imagePath)
{
$adapter = $this->_helper->getImageAdapterType();
$image = new Varien_Image($imagePath, $adapter);
$image->keepTransparency(true);
$image->constrainOnly(true);
$image->keepFrame(true);
$image->keepAspectRatio(true);
$image->backgroundColor(array(255, 255, 255));
$image->resize(self::PREVIEW_IMAGE_WIDTH, self::PREVIEW_IMAGE_HEIGHT);
$imageName = uniqid('preview_image_') . image_type_to_extension($image->getMimeType());
$image->save($this->_getImagePathPreview(), $imageName);
$this->setPreviewImage($imageName);
return $imageName;
}
