io.imsave() problems with passing arguments to plugin "freeimage"

[Sigmund]

Hallo!
To read uncompressed TIFF files I use the freeimage plugin. The reading 
works great but since last week I need to save a summed Image. I used the 
io.imsave() with the freeimage plugin but by default it writs a compressed 
TIFF file. The freeimage documentation provides Flags to use for different 
compressions or for a non compressed type (TIFF_NONE). Can someone tell me 
how to pass theses Flags to the plugin?
I saw that Christophs 'tifffile' plugin does the job but still I would like 
to know how to use the freeimage plug-n for it.

Thanks!

Siggi
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