this works better than my previous attempt
autotrace -color-count 100 -corner-always-threshold 10 -corner-surround 3 -corner-threshold 20 -despeckle-level 10 -despeckle-tightness 2.0 -error-threshold 0.01 -filter-iterations 0 -input-format bmp -line-reversion-threshold .01 -line-threshold 1 -output-file output.svg -output-format svg -preserve-width -remove-adjacent-corners -report-progress -tangent-surround 4 -width-weight-factor 0.0 test.bmp
i found that more saturation is better in the source image