`savefig` adds transparency to my picture?

General Usage
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1

Hi, I have a curious phenomenon here which seemingly appeared from nowhere. I am doing a simple plot (using Plots) and saving it to a file ; but the saved version seems to be transparent.

The MWE is

using Plots
heatmap(rand(8,8))
p=plot!(aspect_ratio=:equal, colorbar=false, axis=([], false))
savefig(p, "test.png")

and here is what I get in my editor : left is my notebook showing the picture, right is the saved picture.

savefig_transpa
savefig_transpa1911×673 24.2 KB

2

This issue occurs while plotting with default gr backend, but not with pythonplot.

For similar result, use keyword argument border=:none, which works fine with gr():

p = heatmap(rand(8,8))
plot!(aspect_ratio=:equal, colorbar=false, border=:none)