Recently, I went out with my camera, captured around 200 10MP photos with my DSLR. I then wanted to upload each picture to the web. Instead of resizing and individually sharpening each one, I created an Action; Photoshop then automatically converted all 200 images for me, whilst preserving the originals in their source folder.
Lets begin:
Preparation
1. I gathered all my images and placed them within one folder.
2. Now, we need to create the ‘Action’. To do this open (Ctrl/Command + O) one of the images in Photoshop and open your actions palette. This can be done by:

You should now see the following palette box:

Creating Your Action
3. Click the “Create New Action” symbol at the bottom of the palette box and name your new action appropriately and hit enter. This will start recording your action, from this point on, Photoshop is recording exactly what you do…

4. So now that photoshop is recording, you are going to need to resize your image. Navigate to Image>Image size and then enter the new values for which you wish to resize your image to and hit ok.
5. Next, Navigate to file>save as and select the appropriate options for your image.
6. Click the “Stop playing/recording” icon at the bottom of the Actions palette.

7. Penultimately, navigate to File>Automate>Batch and select the action you named in step 3, and the source folder that contains the multiple images you want to resize and then specify a destination folder for the new files the process will create.

8. Now hit OK, and you should watch photoshop enter into a flurry of windows. Wait as it does all the leg work for you.
Thanks – It had been a while & I needed a quick refresher on doing this
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