Line Chart is blurred when exporting PDF
Please help me this case:
I plot my data with line chart. It's OK in Form View Mode:
However, when I switch to Preview Mode, the chart is blurred and the lines are not sharp!
And everything is terrible when I export them into PDF, I can not distinguish between lines:
Is there any resolution for solve this issue?
Please help me!
By the way, can I change the color of each line manually, similar I can do in Microsoft Access? Or can I increase the thickness of chart lines?