Manipulate an Image with Scripting

Manipulate an Image with Scripting
Scripting in Photoshop is something rarely touched upon in regular Photoshop tutorials, but is something definitely worth learning. Scripts are a much more powerful way to automate tasks than actions and can be used to do things which normally aren't possible in Photoshop. Here we create a script which will edit any image, giving a stylish way to show your photographs.

Introduction:

In this tutorial I will aim to show how to create this effect using scripts but will also show the corresponding steps in Photoshop, making it easy for you to understand how to alter your script to achieve different results. Photoshop allows scripts in three different programming languages; VBScript, AppleScript and JavaScript, however JavaScript is the only cross platform script available so we will use it, it is also more useful to learn JavaScript. If you haven't ever programmed in JavaScript, you should still be able to understand this tutorial as I have explained all of the concepts in enough detail. When writing JavaScript you are free to use whatever text editor which suits you, however newer versions of Photoshop come with a program called ExtendScript Toolkit (ESTK) which makes scripting a lot easier. This is usually found hidden away in the same folder that contains Photoshop. If you don’t already have this program then you can download it here although it may not work for older versions of Photoshop. There are a few advantages of using this program, mainly the debugger and the fact that you can run scripts straight from the program. For most of the steps I will show what your image should look like after you have run the script. Throughout this tutorial I used this image from stock.xchng, optionally you can save a small size version of this image for the purpose of testing your scripts as the script will run faster this way. The script works for any image of any size.

Step 1

Open the editor you want to use, either ESTK or a regular text editor like notepad for Windows, don’t use a program like Microsoft Word for this. If your using ESTK then there should be a dropdown menu at the top left of the window, select Adobe Photoshop from this and this will link the program to Photoshop. Now we will right a simple script to test we have the settings correct. Type the code shown below into your editor:
alert("Hello World")
What this simple command will do is to bring up an alert box saying ‘Hello World’; we will use alert boxes throughout this tutorial in order to test parts of our script. By putting the quote marks in we are indicating that this is a string which is just a word. Now run your script, If you are using a regular text editor like notepad then the easiest way to run your script is to save the file as ‘myscript.jsx’ then open Photoshop and go file>scripts>browse then select your script. If you are using ESTK then just hit the play button in the top right of the document window. Automatically you should see your alert box pop up. Before testing your scripts close any document that is open in Photoshop.
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Step 2

Delete the alert code you had in the editor as we were only using it to test the settings. There are two settings we want to apply every time we run our script, these are to tell Photoshop to use pixels as the default unit and not to display dialog boxes unless we tell it to. If we wanted to do this within Photoshop we would go edit>preferences>units & rulers and change the rulers value to pixels, obviously turning off dialog boxes is limited to the scripting only. The code for doing this is:

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