It is not just al-Reuters which doctors photos to further its own agenda. Look closely at the above pictures to see how banners are altered by the regime. The first one is by AP news agency and the 2nd one is by the regime's news service ISNA, and they are both from yesterday students' demonstration against the regime. The first pictures' banners are blurry and unreadable and analysis of the second photo shows that the banner is about the criticism of president Immadinjihad.
Some pictures of this protest by regime's ISNA
عکسهای دستکاری شده ایسنا از تظاهرات دانشجویان دانشگاه امیرکبیر تهران