| Answer1: Found out my self long back wanted to answer if someone else wants it
1.
Use the History Brush to selectively restore color, detail, smoothness, saturation, or any other image attribute from an earlier point in a picture's history. The most popular use of the history brush tool is to take a color picture, convert it to black & white, then brush the original color back into a particular feature.
2.
The History palette in Photoshop is the command center for keeping track of changes to your images, undoing editing steps, and correcting mistakes. Not only can the history palette undo and redo changes to your images, it can save snapshots of your work in progress so you can go back to an earlier state or compare multiple revisions of an image.
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