In the beginnings of Christianity most people were illiterate. Therefore the Bible had to be transformed into pictures and symbols; and not only the stories but also the moral duties of everybody. Images and legends of the Saints turned out as useful models for human behavior - easy to tell and easy to understand.
Later, when the crusades began, the Christian Church used propaganda against Muslims, creating pictures of evil, pagan and bloodcurdling people. While the knights and others were fighting abroad, people in Europe were told to pray for them. Daily life was connected to the crusades, also through money-collections - more for the cause of propaganda than for the need of money.
During the period of the Counter-Reformation Catholic propaganda no longer was against foreigners but turned against people at home - the Protestants; and against their publications/books, which got prohibited by starting the so-called index. By then both sides were using disinformation for
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The retouch is the simplest way to change a picture. Small corrections can be made through this way.
A well-known example is the correction of a picture from a Bill Clinton-visit in Germany. In the background of the photograph stood some people, holding a sign with critical comments. In some newspapers the picture was printed like this, in others a retouch had erased the sign.
Another example happened in Austria in 1999:
The right wing party FPÖ had a poster for the Parliamentarian elections which said: 1999 reasons to vote for Haider. Others answered by producing a retouch saying: 1938 reasons to not vote for Haider (pointing to the year 1939, when the vast majority of the Austrians voted for the "Anschluss" to Germany).