I have around 30 pdfs on my Ipad Mini Retina with good quality photos but all of a sudden two that I transferred today now show much worse quality photos than those when I view them in acrobat on a MacBook Pro so I know the original pdfs are good quality before they are transferred to the Ipad Mini. The pdfs on the Ipad Mini that were already there are unaffected and still show the same good quality photos as always but the new ones have horrible colours and are unsharp etc. I have lots of space left on the Ipad Mini, 16.8gb btw. Can anyone suggest what is happening here please? All suggestions appreciated!