I've tried exporting a chart (I have over 50) from excel as .pdf format but the fonts get changed and blurry. It looks good as a .xps file but
pdflatex does not recognise this format.
After a bit of reading I have worked out what is happening. The screen version of the pdf which excel exports is a raster image of the chart and looks terrible. However, the
pdflatex compiled version looks actually quite good. Not sure why that is, anyone know?
SOLUTION This is the link where I found the how but not the why.