Two brush tools include the word history in their names, but their functions are quite distinct. Each has its unique advantages. One similarity between them, however, is that both can apply what are ordinarily layer- or image-level changes to a limited area of an image.
The history brush tool can selectively restore areas of an image to a previous state without changing the subsequent work you've done in other areas of the image. It works in a way similar to the way the clone stamp tool or healing brush tool works. The brush strokes you make with the history brush tool change pixels based on the pixels in same area of the image at a state or in a snapshot that you've designated in the History palette.
The name of the art history brush tool refers to classic brush strokes you might see in painting masterpieces from over the centuries, but it is also related to the History palette. The brush strokes apply pixels based on the selected state or snapshot in the History palette, but the paint strokes are also filtered so that the results are altered in a particular way. The type of filtering is determined by the Style option for the art history brush tool. These choices simulate various kinds of traditional brushwork. You can apply the art history brush tool selectively, painting in some areas of the active layer and leaving other areas of the active layer unchanged.With ordinary filters, the change applies to the entire selected layer.
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