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(PECL imagick 2.0.0)
Imagick::setImageIndex — Set the iterator position
$index 
   )Set the iterator to the position in the image list specified with the index parameter.
This method has been deprecated. See Imagick::setIteratorIndex() .
index The position to set the iterator to
   成功时返回  TRUE 。
  
错误时抛出 ImagickException。
[#1] maulik_Vr at yahoo dot co dot in [2013-04-22 07:37:06]
when you read pdf by getImageBlog and want to get the image or blob of a specific page, use this function as below.
$ims = new Imagick();
$ims->readImageBlob($pdfFileContent);
$ims->setImageIndex(5); //this will return 6th page of the pdf file
$image->setImageFormat('png');
		    //etc 
$blob = $image->getImageBlob();
[#2] Rob Hidalgo [2012-10-09 05:05:54]
When reading a PDF from an ImageBlob, and you want to set the page to be used, this is the function to use.