Sunday, February 1, 2009

Photoshop - Batch Processing

By David Peters

If you weren't already aware, Photoshop has these great features called Actions. Actions can be used for many things, including doing the mundane tasks you don't feel like doing, creating amazing effects, and maximizing productivity.

I recently had the pleasure of a little thing called Batch Processing. I'm a dedicated designer, but there was no way I was going sit in front of my computer for hours changing the Hue/Saturation for every single image for my forum. What is Batch Processing, you say? Well, it's something that processes a batch,and I'm going to show you how to do it.

When you're creating an action you need it to do one thing: Something. In my case, I needed to change the Hue/Saturation for 75+ images from blue to my "trademark" teal. Maybe you need an action for a different purpose, but humor me and tell yourself, "Hey, I need to make my image the same color as hers!" Next, you'll need something to work on. Get a small image, like an icon, preferably the one I'm using for this tutorial.

Next go to Windows - Actions, making sure it is checked. If checked, you should see a tab in the Layers Palette appropriately labeled Actions.

Click on the arrow button to open the Actions menu and go to "new Set." This will create a folder for your action (you don't really need the folder, it just helps with organization.)

Go back to the Actions menu and select "New Action." I'll give you three guesses as to what this does. Now, before recording an action you need to figure out the steps you'll need to take and the order in which you'll need to take them. Since this is a pretty simple action you can do this is your sleep eventually.

Next comes recording. Begin by clicking on the little circle icon in between the square and the triangle at the bottom of the palette. Once that is selected everything you do in Photoshop will be recorded until the end of action. If you do the wrong step no worries, simply stop the action by clicking the square icon and return to your last step.

For this tutorial, the first thing to do is change the Mode of the image to RGB, since .gif files are saved in Index mode which don't respond well to colorization. Go to Image - Mode - RGB with the Action recording.

Next, we need to remove the image of it's current color to make adding our own color easier to apply, so go to Image - Adjustment - Desaturate.

Now that we have a naked grey image, we need to add some color. Make sure your action is still recording and go to Image - Adjustments - Hue/Saturation. I have the settings for my teal color saved in a .ahu (Hue/Saturation) file already so all I have to do is click Load and select Teal.ahu, but since you don't have that you'll have to use the sliders. Use these settings for my color:

Finally, we save it for the web. Check that your action is still recording and go to File - Save For the Web and set your file type and optimization settings. I use the customary GIF settings. Choose the destination directory and save.

You can now stop recording because your Action is complete. Now we will perform a Batch Process to put your Action into effect. This will take all the images in a specified directory and incorporate the changes recorded in the Action.

Go to File - Automate - Batch and make sure the name of the Action Set you just created is in the first dropdown list and the name of the Action is in the second. Set the third dropdown box (next to Source) to Folder and use the Choose button to find your duplicated or created folder of images. For destination, you can either leave it set to it's default "None" to have the action applied and saved in the source folder, or save the "actionized" images into a separate folder. Once you have everything configured to your liking, click OK.

Now you can sit back and watch your images color themselves because you're using Actions and Batch Processing to do your tedious work.

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