I am using the [EMD][1] package for R. This package has a spectrogram function for displaying a Hilbert Spectrum (calculated with hilbertspec). The output however, is really vague and black-white.
This function does not seem to have an option for outputting color images. How can I get the spectrum displayed clearly and if possible in color.
[1]: http://cran.r-project.org/web/packages/EMD/EMD.pdf
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