rodentia wrote:
3) Look for a gimp script for "sg-indexed-decompose." After processing this today (1/6/2014), I am not sure why, but I had to move the new layers out of the script-created group in order to see them;
GIMP does not appear to support Indexed mode images that
contain layer groups (I still need to fix the script to handle this scenario). For the moment, I'd recommend converting your image to RGB mode ("Image->Mode->RGB") before running the script. Better still, use my
Quantize script in your Step 1). Quantize only affects the active layer and leaves the image in RGB mode.
rodentia wrote:
Perhaps I am laying down the gauntlet here: can you streamline the process to get your local trail map ready for vectorization?
It should be possible to write a script to simplify things, even if the simplification is only combining the steps of multiple scripts into one; for example, a script that runs Quantize, Indexed Decompose, and then saves each layer as TIFF.
Going further, depending upon how you are "separat[ing] the trails from the background crap", it
might be feasible to create the requisite vectors with GIMP.