Скачать или смотреть How to Add Two feColorMatrix Results in SVG Filters

Discover how to easily sum the results of two feColorMatrix filters in SVG with this step-by-step guide, using the arithmetic operator to achieve your desired color output.
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This video is based on the question https://stackoverflow.com/q/76484927/ asked by the user 'Meihua' ( https://stackoverflow.com/u/242863/ ) and on the answer https://stackoverflow.com/a/76485885/ provided by the user 'ccprog' ( https://stackoverflow.com/u/4996779/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Add Two feColorMatrix Results in SVG Filters: A Comprehensive Guide

In the world of SVG (Scalable Vector Graphics), one frequently encountered challenge is the manipulation of colors through filters. A common question that arises is: How can you add the output of two different feColorMatrix results together? While there are many blending operations available, a direct addition operation seems elusive. Fear not, as we will break down the process of achieving this using SVG’s feComposite filter with arithmetic operations.

Understanding the Problem

Suppose you have a shape filled with a color, such as rgb(68,114,196), and you generate two different colors using feColorMatrix filters. For example:

The first color matrix yields RGB(43, 71, 123)

The second color matrix produces RGB(8, 13, 22)

Your goal is to combine these two colors to result in RGB(52, 88, 156). Unfortunately, there isn't a built-in "add" operator in feComposite. However, we can achieve this with the right approach.

The Solution: Using feComposite with Arithmetic Operator

The good news is that the feComposite filter supports an arithmetic mode, where you can define a custom composition formula. Here’s an overview of how it works:

Breakdown of feComposite Parameters

The syntax for the arithmetic mode is as follows:

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

i1 and i2 represent the input channels (results from the first and second color matrices).

k1, k2, k3, and k4 are parameters that you can adjust to achieve the desired output.

Parameters for Simple Addition

To achieve a simple addition, set the parameters as follows:

k2 = 1

k3 = 1

k1 = 0 (By default, it's set to 0)

k4 = 0 (By default, it's set to 0)

This effectively sums the two input colors.

Full Example: Implementing in SVG

Below is the complete SVG code that utilizes the feComposite filter in arithmetic mode to add the results of two feColorMatrix filters:

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

Key Points to Note

Ensure your feColorMatrix values are correctly set; there was an error in the second color matrix in the original question by having one value too many.

This solution provides a dynamic way to add any two colors derived from color matrices within an SVG filter setup.

Conclusion

By using the feComposite filter with the arithmetic operation, you can successfully sum the results of two feColorMatrix filters in SVG. This method allows for flexibility and customization, enabling designers and developers to create visually stunning graphics with ease. Don't hesitate to experiment with different color matrices and parameter combinations to achieve your desired outcomes!

Thank you for reading, and happy coding!