In this Photoshop CS4 tutorial I will continue the History Panel. As we have know in the previous tutorial that History Panel can be use to undo the editing step, right know we will make an undo but only in some part of the image. Not whole of them. We can do this by using History Brush tool.
History brush tool is able to make an undo just like when we using History panel or press CTRL+Z. But this tool can only affect a stroked area, so we can specify which part of the image that we need to change its state.
In this image above, I open a sample image from Photoshop CS4. I add some effect and image adjustments in this image as example.
First, I make this image in to black and white by using Image > Adjustment > Desaturate.
Second, I add some grayscale noise by select Filter > Noise.
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