How to make new action button in Photoshop:

If you find yourself have to repeat same task over and over in Photoshop. Do you need to perform a task on a group of images? Have you tried running an Action in Photoshop? Actions are great time savers and can simplify your life! As an example, let's follow an actual image-editing sequence (using one of Harald's photos). Some of the images were horizontal, some were vertical. Instead of having to do the manual Image > Rotate Canvas > Rotate 90º CCW procedure for each image, I set an action and a function key to press any time I needed a rotation. Here is how it works:

When you create a new action, the commands and tools you use are added to the action until you stop recording.
To guard against mistakes, work in a copy: at the beginning of the action before applying other commands, record the File > Save A Copy command (Illustrator) or record the File > Save As command and select As A Copy (Photoshop). Alternatively, in Photoshop you can click the New Snapshot button on the History palette to make a snapshot of the image before recording the action.
Open a file.
In the Actions palette, click the Create New Action button , or choose New Action from the Actions palette menu.
Enter an action name, select an action set, and set additional options:
Function Key Assigns a keyboard shortcut to the action. You can choose any combination of a function key, the Ctrl key (Windows) or Command key (Mac OS), and the Shift key (for example, Ctrl+Shift+F3), with these exceptions: In Windows, you cannot use the F1 key, nor can you use F4 or F6 with the Ctrl key.
Note: If you assign an action the same shortcut that is used for a command, the shortcut will apply the action rather than the command.

Color Assigns a color for display in Button mode.

Click Begin Recording. The Begin Recording button in the Actions palette turns red .
Important: When recording the Save As command, do not change the filename. If you enter a new filename, that new name is recorded and used each time you run the action. Before saving, if you navigate to a different folder, you can specify a different location without having to specify a filename.
Perform the operations and commands you want to record.
Not all tasks in actions can be recorded directly; however, you can insert most nonrecordable tasks using commands in the Actions palette menu.

To stop recording, either click the Stop Playing/Recording button, or choose Stop Recording from the Actions palette menu. (In Photoshop, you can also press the Esc key.)