Welcome to the PS Introductory Tutorial, through which you will learn the basic tools and usage skills of Photoshop. I'll introduce you to the Photoshop workspace and show you how to use the Undo command.
undo command
Undo single or multiple steps, and use the History panel.
The editor will walk you through how to undo, redo and cancel operations during the editing process. You can choose this file from the practice file of this tutorial or use your own image and follow along with me.
First we are going to draw some lines on this image, select the brush tool in the "Tools" panel.
Then go to the "Swatches" panel, click on a color, you can choose any color you like. Move the mouse into the image to draw a line.
If your brush is not big enough, you can go to the options bar of the brush tool and click "Brush Picker" (brush picker) to set the brush size.
Now I close the picker, draw a few more lines, in the Swatches panel, choose another color, draw another line, and draw another.
If you want to cancel the previous operation in Photoshop, such as the pink line drawn here, the quicker way is to press the Command + Z keys. I try it now and can see the pink lines disappear. I can get it back on again by pressing Command+Z again. In other words, pressing these two shortcut keys on the keyboard can undo and redo the last operation.
If you don't like using shortcuts, prefer to use menus. Then in the "Edit" menu, select the "Undo Brush Tool" (undo brush tool), Photoshop will even tell you what will be undone.
Now select the "Redo Brush Tool", what if you want to undo multiple steps? In this case, you need to select "Step Backward" in the "Edit" menu. By default, you can go back up to 50 times, canceling a step each time.
Again, you can choose to go forward, select "Step Forward" in the "Edit" menu, select again, select again.
Another way to go forward and back is by using the History panel. The History panel, located here.
If you can't see it, go to the "Window" menu and select "History". Now, I put the mouse on the bottom of this panel, I can see a double arrow, move the mouse down to expand the panel.
Now we can see in this panel that there is a separate column for each action that I do.
Each column corresponds to the three lines I drew with the brush, notice how the panel changes if I draw another line, the fourth line I draw is also recorded in the History panel.
Now we use other tools to see how its operation is recorded, go to the tool panel and select the dodge tool. This tool is used to lighten the color of the image, just like the brush tool.
The dodge tool also has a brush, to make the dodge tool bigger, go to the tool's options bar and drag the "Size" slider, click on an empty area to turn off the "Brush Picker" .
Now coming to the image, I drag the brush a few times over the leaves, and every time I let go of the mouse and drag again, there is a dodge tool status being recorded in the History panel.
The nice thing about recording these states in the History panel is that you can undo operations step by step, like this.
Or you can jump to a specific state, like this.
Every time you do this, everything in the image is restored to what it was at that point in time, and you can also step forward in the History panel, like this.
There are two things to note about the History panel.
If you go back to a previous state, like back here, then you did something else. Let's say I dodge this area of the image, notice the changes in the history panel.
It can be seen that all operations after this state disappear. It is as if you returned to a fork in the road and chose a different road. After passing the fork in the road, everything on the road at the beginning disappeared.
The second thing to note is that when you close the image, whether you save it or not, the history will disappear. The History pane will be cleared the next time you open the image.
If you are not comfortable using the History panel, you can use the shortcut command in the Edit menu and choose Undo to undo a single step.
Choose Step Backward to undo multiple steps, whichever method you use, giving you the flexibility to correct any mistakes or try new approaches when editing images.
undo
To undo your last action, choose Edit > Undo or press Command+Z (macOS).
To redo your last action, choose Edit > Redo or press Command+Z (macOS) again.
To undo multiple steps, select Edit > Step Backward multiple times, or select a step in the History panel.