Access to file header in filter plugin

Hello all together,



I have a problem with my filter plugin. I need a support, from any suite or direct callback, which give me an access to the file header of that image which I filtered. Problem is, that I have to write some tiff-tags into the file header and additionally I will give the full possibility of filter plugin support.



I know that normally I have to perform this tiff-tag writes in a export-plugin, but on this way I have to use a tow step work flow. First is to work with the filter-plugin and after all is done, it write the needed data with the pseudo-resource suite. Second is to read the informations in the export-plugin and write the tiff-tags there.



But I try do both in one step, explicitly in the filter-plugin.

Is there any way to get file header informations, manipulate them and write it back?



Thanks and wish a good time.