How to draw a high-contrast spectrogram?

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zhehao.nkd on 26 May 2021
Commented: zhehao.nkd on 31 May 2021
Some software for sound analysis can draw spectrograms with higher contrast (backgrounds are almost zero). I was wondering what tricks may I use to generate similar spectrograms.
Figure-1 A spectrogram generated by matlab function spectrogram()
Figure-2 A spectrogram of the same audio signal generated by a software

Answers (1)

Sulaymon Eshkabilov
Sulaymon Eshkabilov on 26 May 2021
Use colormap()
zhehao.nkd on 31 May 2021
Thank you for your reply! But I am sorry that the way I ask my question may be misleading. Increasing the contrast by applying different colormaps may not be what I need. Instead, I would like to improve the contrast by cleaning the noisy background as the second Figure shows. Is there any possible solution?

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