void ContextMenu_TestColorSystem()
{
int maxi = 10;
double dm = 1.0 / maxi;
for (int i = -maxi; i < maxi; i++)
{
var fi = ((double)i) / ((double)(maxi / 2));
var s = SpanF.Create(fi, fi + dm);
var g = SpanAPI.spanColorSignedForGreen(s);
Debug.Log("s=g: " + s + "=" + g);
}
}