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Can I read an image from blob?

Subject: Can I read an image from blob?
Date: Thu, 24 May 2007 18:19:10 +0800
hi guys
I want to use jmagick to modify an image which already in memory, and how can I 
read the image in the form of blob?
I tried the following code:
     info = new ImageInfo();
    //image data is in byte 
     image = new MagickImage(info, bytes);
     chopped = image.chopImage(rect);
but, there is an exception :Cannot retrieve image handle
how should I do?
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