Hi All, I recently made definition augmenting the bitmap script posted awhile back that does what you are requesting. I posted it here in the Files section:
http://groups.google.com/group/grasshopper3d/web/Bitmap2Block.zip?hl=en Look at the colortable script component. I had to split off the first few because there are some unwanted items at the beginning so it is not ideal but it does work as desired. Cheers, Chris K. Palmer
