Fill in Plots vspan saves as black

Question

I create the plot I need in julia, but upon saving with savefig, the vspan fill is printed as black, although it is specified as very light red.

This is what is show in my notebook and I am savign but when I save it as pdf, the red blocks become black imposing over the index I want to track Surprisingly, this does not happened when I savefig as png, but I would prefer pdf for the manuscript I am writing.

Thanks for tips how to fix this!

Answer 1

The issue is that in pdf, the borders of the vspans are printed quite thick and black while slim in png. I lazily plotted each vspan of width 1 x-axis-tick, so that is what we see. When I specify correctly the vspan intervals [start, end] it is clear

Current setup julia to 1.8.5 and the libraries.

  [7073ff75] IJulia v1.24.0
⌃ [91a5bcdd] Plots v1.6.12

and works correctly straight out of box of course.

Answer 2

For best color for publishing, you want to save the image as CMYK PDF/X color, but Plots does not do this. You can use the free publishing app Scribus (under Linux, OSX, Widows, etc) to do the conversion to PDF/X CMYK from png or jpg though.