1. I think the technology we have today would greatly impact Mathew Brady's pictures. He did a lot of portraits which were also black and white. He could have helped change things about people that they didn't particularly like about themselves. He also could have added color to show the subjects story in a better way.
2. I think he would have used it to show more of the darkness of his pictures. The black and white did good job of expressing the hard times people went through during the war but if he added the color of the peoples blood, then it might have shocked more people and got their attention.
3. Mathew Brady could have manipulated his pictures or not, either way he was the main reason why the civil war was so popular. It was because of him that people were able to picture and understand the war.