Plots saved to file loose colour

[evan-wehi]

I’m saving Gadfly plots as PNG, SVG or JPG but the colour is stripped from them, making them useless. The problem occurs on Mac silicon and linux and the current stable releases of Julia and packages.

Here is the plot in the edit plot window. Interestingly, if I save from the plot window it is fine.

Here is the plot after writing to a file:

If I save a plot on its own it's fine, it's the stacked plots that are the problem.

Here is a code to reproduce:

using DataFrames, Gadfly, Cairo, Random

rd(m) = m .+ 100*randn(100) 
f1 = DataFrame(BCL2=rd(500), BCLxL=rd(500), MCL1=rd(500), NOXA=rd(500), dose="0mg")
f2 = DataFrame(BCL2=rd(700), BCLxL=rd(700), MCL1=rd(700), NOXA=rd(700), dose="200mg")
f4p = vcat(f1, f2)

layers = Plot[]
for protein in [:MCL1, :NOXA, :BCLxL, :BCL2]
  l = plot(f4p, x=protein, color=:dose, Geom.histogram)
  fn = "$(string(protein)).png"
  push!(layers, l)
  l |> PNG(fn)
end
layers = reshape(layers, 2, 2)
h = gridstack(layers)
display(h)
fn = "broken.png"
h |> PNG(fn)

[Mattriks]

Try putting the h |> PNG(fn) before the display(h) line?

[evan-wehi]

Nice catch! If I swap those lines, the file is fine but the plot in the editor window is corrupted.

[bjarthur]

so display mutates its input? is that expected?? is there a fix???