Tif Image causing memory leaks

I have a list of images from my app budle in a tableview, when I select one a view controller/imageview opens with the image. When the view is closed via navcontroller back button I am getting serious memory leaks.
The leaks are in the 100mb size.
I have used instruments leaks and it seems to only leak when a large Tiff image is rendered and then closed. The call to " 1 ImageIO invocation function for block in TIFFReadPlugin::DecodeBlocks(IIOImageRead*, GlobalTIFFInfo*, ReadPluginData const&, TIFFPluginData" seems to be the culprit. JPG and PNG and small Tif files don't seem to leak. Any Ideas?

Tif Image causing memory leaks
 
 
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