The Auk can be configured to calculate a vegetation index for each
image as the image is acquired. The kind of index (or indices; there can be
more than one) is specified in the indices.txt file. It can take a several seconds
to complete the processing for each image at full resolution: The lens is corrected for vignette effects,
the false color RGB is calculated, and after that the band ratio calculations
are performed.
To speed things up, the user can specify reduced size output images. The scaling is done in powers of two;
1/2, 1/4, 1/8, etc.