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GDI Error and Images loaded via a stream

Part of the improvements to Cropper was to save a thumbnail of the image in the CropSet file. This meant loading was dramatically improved as it didn't have to load the original and make a thumbnail each time.

However, it seems an image loaded using the FromStream method will keep the stream alive during the life time of the image (see link)
http://support.microsoft.com/Default.aspx?id=814675

So, attempting to save it to another stream will cause the Generic GDI+ error.

The way around, as suggested by MS, is to create a copy of the image. They have given two ways of doing this, I don't know which is best, but I've chosen the first.

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