Messages from Usenet group comp.lang.idl-pvwave, compiled by Paulo Penteado
David Fanning writes: > In two-color diverging color tables, one color now goes > from 0 to 127, the second color goes from 128 to 255. > You can see this best if you load 16 colors: > > IDL> CTLoad, 0 > IDL> CTLoad, /Brewer, 19, NCOLORS=16 > IDL> CIndex An easier way to see the color differentiations might be like this: IDL> XColors, /Brewer, NCOLORS=16 Cheers, David -- David Fanning, Ph.D. Fanning Software Consulting, Inc. Coyote's Guide to IDL Programming: http://www.dfanning.com/ Sepore ma de ni thui. ("Perhaps thou speakest truth.")
David Fanning writes: > There were a couple of problems with the Brewer color table > file I produced last week (which I had just copied from > Mike Galloy's implementation). In particular, the diverging > color tables didn't diverge exactly in the middle of the > scale. There was also some kind of problem on the high end > of the color table, such that if you reduced the color table > to, say, 16 colors then color 15 and 16 were indistinguishable. > > I've fixed both of these problems in a new color table file: > > http://www.dfanning.com/programs/fsc_brewer.tbl If you are interested in seeing what some of these color tables look like, you can see a representative sample of the 27 color tables (all reduced to 16 colors) in this article: http://www.dfanning.com/color_tips/brewer.html Cheers, David -- David Fanning, Ph.D. Fanning Software Consulting, Inc. Coyote's Guide to IDL Programming: http://www.dfanning.com/ Sepore ma de ni thui. ("Perhaps thou speakest truth.")