Thu, 08/13/2009 - 06:50 am
I'm trying to make a log scaled contour plot. That is, a contour plot that has the colors (for say the rainbow256 option) logarithmically spaced instead of linearly spaced. It would be great if igor could do this for me. I see that I can do this manually by creating a matrix with a column for the z-values, and columns for the RGB specifications. Even if igor could give me a matrix with the RGB numbers for the rainbow256, and then allow me to change the z-values that correspond to the different colors, that would be helpful. Does anyone have any advice on doing this?
Thanks
August 13, 2009 at 04:22 pm - Permalink
Thanks
August 14, 2009 at 08:59 am - Permalink
August 14, 2009 at 10:00 am - Permalink
August 18, 2009 at 11:48 am - Permalink
November 13, 2009 at 09:55 am - Permalink
Are you still talking about Contour Plots or generally?
Did you notice the "lookup table" feature for Image Plots, which allows you to apply e.g. Gamma corrections?
see
DisplayHelpTopic "Color Table Ranges - Lookup Table (Gamma)"
November 13, 2009 at 12:55 pm - Permalink
It creates a logarithmic color lookup table for a image, a new entry appears in the graph menu. ( Has to be updated manually if display settings were changed). See
I often use it for displaying LEED images without changing the data, dont know if it works for contour plots though.
Christian
November 16, 2009 at 04:04 am - Permalink