>> The channel chooser and formula selection shouldn't be too hard to add.
>> The legend might be a little tricky. Frei0r doesn't provide a good way
>> to render text. So I would have to add a dependency on some other
>> library like pango or Qt.
>
> How about Cairo? There already are some frei0r effects depending on
> Cairo, so chances are good that package managers install Cairo as
> dependency with frei0r anyway.
These have been added now:
https://github.com/ddennedy/frei0r/pull/5#event-158437274
You can choose between NDVI and VI. You can also select the channel for I and V.
I added an optional legend to the bottom. The text is drawn by Cairo. If Cairo
is not available, then the legend is just a gradient without any text.
~Brian
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