Generated a better-sized large pbm earthmap for the dynamic texture-mapping work in SaVi development, now I've found Gimp's threshold filter.
This is going to be tricky; I need 'Large coverage window' as a menu option (destroys small coverage window if it's open...) to make best use of this map, and ideally to have the dynamic texturemapping work off the same coverage map if the large coverage window is open (and we're default cylindrical), and use its own if not. Doing all the computing for multiple coverage maps at once is best avoided if possible. Generating a scalable earth bitmap from the vector set already used by Geomview would be ideal, but hard to do; the coverage plot is already scalable.
Zeldman pointed out the existence of Eric Meyer's colour blender. After getting colour picking and random colours working in SaVi over Christmas and into sourceforge cvs, this (try two intervals) was what I was aiming for, by blending colours 1/4 together to generate 2/3 diversity/intervals and random blends. I need to support this in the coverage window, along with a save-coverage-window-as-ppm option based on the write-scratchfile code I've already done for the texturemapping. zlib support for compression of that and of scratchfiles would be a bonus...
Those little things are easier to do and less time-consuming than the dynamic texturemapping stuff and getting that interacting well with Geomview; quick wins that will let me release 1.2.2 with a clear conscience.