# Is there a way to do "digital phosphor" type of plots for time series data?

**URL:** <https://discourse.julialang.org/t/is-there-a-way-to-do-digital-phosphor-type-of-plots-for-time-series-data/56490>\
**Category:** Visualization\
**Created:** [March 4, 2021, 6:11pm UTC](https://discourse.julialang.org/t/is-there-a-way-to-do-digital-phosphor-type-of-plots-for-time-series-data/56490 "2021-03-04T18:11:44Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![jheinen](https://sea2.discourse-cdn.com/julialang/user_avatar/discourse.julialang.org/jheinen/32/2787_2.png) [@jheinen](https://discourse.julialang.org/u/jheinen)\
**Post date:** [March 5, 2021, 11:49am UTC](https://discourse.julialang.org/t/is-there-a-way-to-do-digital-phosphor-type-of-plots-for-time-series-data/56490/12 "2021-03-05T11:49:23Z")

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> [@jheinen](#):
>
> ```julia
> using WAV
> using GR
> 
> file = joinpath(dirname(Base.find_package("GR")), "..", "examples", "Monty_Python.wav")
> y, fs = WAV.wavread(file)
> 
> shade(y, colormap=-GR.COLORMAP_BLUESCALE, ylim=(-1,1))
> 
> ```

Sure, you simply have to change the color scheme (`usecolorscheme(2)`) and remove the minus sign for the colormap:

 ![Screenshot 2021-03-05 at 12.48.19](https://global.discourse-cdn.com/julialang/original/3X/2/3/23736584092dc75e43e56fc5e43ca8f1af0bd21f.png)

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