Well, another way.... As I mentioned in #2 the gimp_gmic_qt plugin http://www.gmic.eu has several filters that might be suitable. There is an ektachrome filter that might work, adjust the parameters to suit. Copy those to clipboard.
That can go in a script-fu along with filters to add a border and make a vertical stack. Sorry, no text at the moment. Just for info the script-fu attached. Registers in the tools menu. For Gimp 3 . Remember this does need the gmic plugin.
That can go in a script-fu along with filters to add a border and make a vertical stack. Sorry, no text at the moment. Just for info the script-fu attached. Registers in the tools menu. For Gimp 3 . Remember this does need the gmic plugin.