Updates: 1) I've improved the GTiff driver to support updating color interpretation in udpate mode 2) I've improved gdal_edit to support a -colorinterp_X red|green|blue|alpha|undefined option where X is the band number. 3) I've fixed "tiffset -s ExtraSamples 1 val" to work (the issue was specific to specifying just one value indeed)
Note that with libtiff when you change an existing tag, the file size will slightly increase each time you do a change. Even -- Spatialys - Geospatial professional services http://www.spatialys.com
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