color lookup table similar to "cube helix"?

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Mon, 07/28/2014 - 06:37 pm

I just find an interesting lookup table called 'cube helix' (http://www.mrao.cam.ac.uk/~dag/CUBEHELIX/), which is a "implementation of a colour scheme which is intended to be perceived as increasing in intensity" as noted by its author. The benefit is that is has "an underlying increase in the perception of the brightness of the colors used". So no "burning out to red for the high data values, but using yellow/green for intermediate data values, which are perceived as being brighter than the red".

I take a quick look into igor manual but could not find information about each lookup table whether a similar scheme is used in igor. Can anyone share some knowledge on this?
That does look nice.

We don't have a color table built in that does that. Some of our color tables have sort of the same effect of getting lighter at higher values- look at VioletOrangeYellow or the single-color ones like Red or Magenta or Mud.

For many purposes you can create your own three-column color wave to use as a color table. See this:
DisplayHelpTopic "Indexed Color Details"
DisplayHelpTopic "Linear Indexed Color"

You should be able to implement expressions to fill a wave with RGB values according to the algorithms on the page you link.

John Weeks
WaveMetrics, Inc.
support@wavemetrics.com

July 29, 2014 at 09:15 am - Permalink