how to savefig with dpi=300

[biona001]

I created some map images following these example code. I was wondering how to save the figure in high resolution (e.g dpi=300)? I tried including dpi=300 in Layout, but it didn't do anything...

Issue #4 seems to have solved this.

[sglyon]

Hi @biona001 I'm not 100%, but you'll probably have most luck checking out this repo: https://github.com/plotly/Kaleido

We use Kaleido now for exporting/savefig so any options they support should be supported here also.

[empet]

Hi @biona001,

For savefig you can use the same parameters as for the plotly.io.write_image: https://plotly.github.io/plotly.py-docs/generated/plotly.io.write_image.html. You can pass the image width and height in pixels, not dpi.
Note that
savefig(pl, "myplot300x300.png", width=300, height=300)
and
savefig(pl, "myplot600x600sc05.png", width=600, height=600, scale=0.5)
save the same size images, but the former preserves the default font_size , set by PlotlyJS for ticklabels, while the latter displays ticklabels of reduced size (by a factor of 0.5).
I checked this particularity for the following plot, by saving the plot pl as a png and as apdf file, as well:

using PlotlyJS
plasma = [[0.0, "#0c0786"],
         [0.1, "#40039c"],
         [0.2, "#6a00a7"],
         [0.3, "#8f0da3"],
         [0.4, "#b02a8f"],
         [0.5, "#cb4777"],
         [0.6, "#e06461"],
         [0.7, "#f2844b"],
         [0.8, "#fca635"],
         [0.9, "#fcce25"],
         [1.0, "#eff821"]];
n= 511
J = [i for i in 0:n, j in 0:n];
tr = heatmap(z=xor.(J', J), colorscale=plasma, showscale=false)
pl = plot(tr, Layout(width=400, height=450, yaxis_autorange="reversed"))

[biona001]

Ok, thanks for the response.

I'm leaving this issue open for now since it doesn't seem like there is a simple solution, but feel free to close it.

[empet]

I searched Plotly forum https://community.plotly.com/ for how to save a plot as a pdf file with 300dpi, and found no answer, but on SO there is a solution:https://stackoverflow.com/questions/61199397/export-300dpi-tiff-of-plotly-plot-in-r.
I tried it for a map from your posted link, and it works with:

savefig(pl, "dpi300.pdf", width=8*300, height=11*300)

8.5 x 11 inches is a pdf page.

[StepanSushko]

got unsupported keyword arguments "width", "height"

[empet]

@StepanSushko
What version are you running? I've just checked it with Julia 1.7 and PlotlyJS.jl, v. 0.18.8:

savefig(pl, "myfig.pdf",  width=4*300, height=3*300, scale=1) # pl = Plot(....)

and got this pdf file: https://github.com/empet/Datasets/blob/master/Images/myfig.pdf.

[chelseas]

Got the unsupported keyword thing too with:

Plots v1.22.2

And

Julia Version 1.6.1
Commit 6aaedecc44 (2021-04-23 05:59 UTC)
Platform Info:
  OS: Linux (x86_64-pc-linux-gnu)
  CPU: AMD Ryzen 7 4800H with Radeon Graphics
  WORD_SIZE: 64
  LIBM: libopenlibm
  LLVM: libLLVM-11.0.1 (ORCJIT, znver2)