This Report says that all of these were masters of image control and could use their image (litereally) towards their respective causes.
Quoted from the article:
While on the the topic of Mahatma Gandhi and the use of his image, here is an interesting site of Foundation for Better Life which is using the images of Mahatma Gandhi and others to inspire people to do better in life. These Billboards are placed in California and am sure are making a difference to the lives of people. Do have a look at all of them (Link)
......Indian leader Mahatma Gandhi as a skilled self-publicist, who harnessed the media to great effect. A pair of pictures, taken over 40 years apart, shows him as a young lawyer, the picture of British middle class, wearing bow tie and winged collar, and later as an Indian in ordinary dress, who would appeal to the masses.
Adolf Hitler initially kept photographers away, but came to recognize their importance as a propaganda tool. The leader`s favourite photographer, Heinrich Hoffman, and assistants took an estimated 2.5 million pictures of the Fuehrer from 1935 to 1945.
Billboard used by Fondation for Better Life