Martha Rosler
[Artist, b. 1943, Brooklyn, New York, lives in New York.]
The question at hand is the danger posed to truth by computer-manipulated photographic imagery. How do we approach this question in a period in which the veracity of even the straight, unmanipulated photograph has been under attack for a couple of decades. 
Malick Sidibé
[Photographer, b. 1935, Soloba, Mali, d. 2016, Bamako, Mali.]
Photographs are reality: they never lie, and that’s important to me. John Szarkowski
[Curator, critic, historian, and photographer, b. 1925, Ashland, Wisconsin, d. 2007, Pittsfield, Massachusetts.]
A beginning photographer hopes to learn to use the medium to describe the truth. The intelligent journeyman has learned that there is not enough film to do that. God (Judeo-Christian Version)
[Omnipotent artist, critic, creator and destroyer, before time, lives everywhere and nowhere.]
Driven back and utterly shamedShall be those who trust in an image.
(Judeo-Christian version of God; Isaiah 42:17)
William Blake
[Poet and artist, b. 1757, London, d. 1827, London.]
Man is led to believe a lie, when he sees with, not through the eye. (Aphorism adopted by Edward Weston) Martine Franck
[Photographer, b. 1938, Antwerp, Belgium, d. 2012, Paris.]
A photograph is not necessarily a lie, but it isn’t the truth either. It’s more like a fleeting, subjective impression. Ralph Steiner
[Photographer, b. 1899, Cleveland, Ohio, d. 1986, Hanover, New Hampshire.]
“The camera cannot lie” is true only in the sense that it is a little harder to tell a complete falsehood with a camera than with words. Abelardo Morell
[b. 1948, Havana, Cuba, lives in Brookline, Massachusetts.]
There is a lot of social photography being done now to point to the untruth of photography. It’s getting very dull now. So, okay photography doesn’t tell the truth. So what? Everyone has known this forever.