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IMG_File : tag handling

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  I see that other formats have available tags.


  I am wondering how those are setup.


  I tried setting things up in my


        class IMG_PPMFormat : public IMG_Format {

                virtual void        defaultTags(IMG_FileTagList &tags) const




  But it does not show up


  I see a comment about only IMG_Format being allowed to call initializeTag


  How are tags, global options and texture options related, if at all ?




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