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This colour scheme is described in more detail in:
When you are satisfied, press one of the `make ...' buttons, which will write the text of the `look-up-table' file into another window/tab. The formats available are (a) DS9/saoimage (copy to a local file to then read in), (b) decimal values for the fraction along the look-up-table (i.e. 0.0 to 1.0), and red/green/blue intensities (again 0.0 to 1.0), (c) the fraction along the look-up-table, and red/green/blue intensities in hex (00 to FF), (d) kvis look-up-table (in hex format, to convert to binary for use, copy to a local file and then (for Unix/Linux) use "xxd -ps -r file.txt file.kf", where file.txt is the file you save the output to, and file.kf is the binary file to write). You can reverse the output from the usual black → white to white → black if needed.