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Learn how to incrementally adjust colors in an InDesign swatch using ExtendScript. This simple guide covers extracting, modifying, and reassigning color values within InDesign.
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Changing InDesign Swatch Values Incrementally with ExtendScript

If you're working with colors in Adobe InDesign and using ExtendScript (a JavaScript-based scripting language), you may want to adjust your color swatch values incrementally instead of setting them to fixed values. This is particularly helpful when you need fine control over your design colors.

In this guide, we'll look at a real-world scenario where you want to change an InDesign color swatch named mySwatch from its current values (C10 M20 Y30 K40) to new values. Specifically, you'll learn how to decrease the first two color values by 1 and increase the last color value by 1, while keeping the third value unchanged. Let's dive into how to achieve that step by step.

Understanding the Problem

You initially have a color swatch with the following CMYK values:

C: 10

M: 20

Y: 30

K: 40

You want to modify these values as follows:

C: Decrease by 1

M: Decrease by 1

Y: Remain the same

K: Increase by 1

Therefore, your target values will be:

C: 9

M: 19

Y: 30

K: 41

Step-by-Step Solution

To implement this adjustment in ExtendScript, follow these simple steps:

Step 1: Extract Existing Color Values

First, you need to get the current color values of your swatch and assign them to a new variable.

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Step 2: Modify the Color Values

Now that you have the color values stored in a variable, you can perform arithmetic operations on them. For this task, you will decrement the C and M values and increment the K value:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Reassign the Modified Values back to the Swatch

After modifying the values as needed, you can now reassign them back to the swatch:

[[See Video to Reveal this Text or Code Snippet]]

Final Code Example

Here's the complete code snippet you would use to change your swatch values incrementally:

[[See Video to Reveal this Text or Code Snippet]]

Note: This code hasn't been tested in a live environment yet, so it may require adjustments based on your specific setup.

Conclusion

With this guide, you should now be able to change the InDesign swatches incrementally using ExtendScript. By extracting, modifying, and reassigning color values, you gain finer control over your design elements and can enhance your flexibility in color management.

Feel free to explore further and experiment with different values and operations to better suit your design needs!