I've got a problem with Adobe Illustrator CC. The fact is that I create a design just with black and red colour (#EC0000). But then, when I save this document in PDF or when I export it to JPEG, and open them with Adobe Reader and "Photos" software from Microsoft respectively, that red colour changes into a darker one. First I thought it was cause of the options I select when I save the document. But taking into account that when I open the PDF or the JPEG file with Illustrator CC, the red colour changes again to he brighter one, that made no sense for me... What could be the reason then?