Husl palette equivalent

[Zaf4]

I tried to find the default color palette of R's ggplot (husl_palette in seaborn) in lets-plot but I couldn't. It is a great palette for categorical data. So, I think it would be a great addition to lets-plot.

Here is the link to the seaborn one: https://seaborn.pydata.org/generated/seaborn.husl_palette.html
And this to the R's ggplot: https://scales.r-lib.org/reference/hue_pal.html

FYI, I already tried following existing palettes.

diverging = ["BrBG", "PiYG", "PRGn", "PuOr", "RdBu", "RdGy", "RdYlBu", "RdYlGn", "Spectral"]
qualitative = ["Accent", "Dark2", "Paired", "Pastel1", "Pastel2", "Set1", "Set2", "Set3"]
sequential = ["Blues", "BuGn", "BuPu", "GnBu", "Greens", "Greys", "Oranges", "OrRd", "PuBu", "PuBuGn", "PuRd", "Purples", "RdPu", "Reds", "YlGn", "YlGnBu", "YlOrBr", "YlOrRd"]

and the viridis ones,
viridis = ["A","B","C","D","E","turbo","twilight"]

and none of them looks like ggplot2's default palette.

[alshan]

Have you tried "hue" scales?
https://lets-plot.org/pages/api/lets_plot.scale_color_hue.html

[Zaf4]

I tried it after your suggestion. They use the same principle but somehow with the same h,c,l values resulting palettes are very different.

[Zaf4]

Here is the R's ggplot default.

Then, seaborn using 'husl'

Lastly, from lets-plot + scale_fill_hue()

Obviously, seaborn and ggplot produce very similar colors. But, lets-plot scale_hue produces different set of colors even with the same parameters.

Difference might be scale_hue documentation says " Qualitative color scale with evenly spaced hues for color aesthetic."

While husl_palette says "This function is similar to hls_palette(), but it uses a nonlinear color space that is more perceptually uniform."

[alshan]

You are right, there is significant difference in colors. Likely this is because lets-plot scale_hue uses HSV color space instead of HSL under the hood. Certainly need to be fixed.