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Less vibrant colors when plot is exported

Hi All,
I have started using plot.ly in the past few days and realized that when exporting a heatmap as a .eps or .pdf file that colors lose their vibrancy. The plot looks much more visually appealing on my browser window. Any idea how I can correct this? Apologies if a similar question has already been posted before or if I have chosen the wrong forum category. Thanks in advance!
My best,
Cláudio