Images like negative


#1

Hi guys , how can I solve this problem (The image looks like the negative and there is no anything clear in it ) while reading the book ?


#2

Hm. That is weird. Where did you get the book?


#3

Actually, I don’t remember the website .But what I’m sure about is that it was free , if that useful. Do you think if I can change the file Extension is that useful ?