SVG feConvolveMatrix Filter
feConvolveMatrix applies a custom kernel matrix to SVG content, enabling effects like sharpening, edge detection, and embossing.
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Supports PNG, JPG, BMP, WEBP up to 5MB
How Convolution Matrices Transform Pixels
feConvolveMatrix processes each pixel based on a weighted combination of its surrounding neighbor pixels, defined by a kernel matrix specified in the order and kernelMatrix attributes, and different specific kernel value combinations produce dramatically different effects — a sharpening kernel, an edge-detection kernel, or an embossing kernel from the same underlying primitive.
- Processes each pixel based on a weighted combination of neighboring pixels
- The order and kernelMatrix attributes define the specific kernel used
- Different kernel values produce sharpening, edge detection, or embossing
Practical Applications and Performance Considerations
feConvolveMatrix is among the more computationally expensive SVG filter primitives since it processes every pixel against its full neighborhood, so it's worth testing performance carefully on large or frequently animated elements, reserving it for cases like a deliberate emboss or sharpen effect where the visual result specifically justifies the added rendering cost.
- Among the more computationally expensive SVG filter primitives available
- Testing performance is worthwhile on large elements or animated content
- Best reserved for effects where the specific visual result justifies the cost
Frequently Asked Questions
What's a simple example kernel matrix for a basic sharpening effect?
A common 3x3 sharpening kernel uses a center value larger than the sum of its negative surrounding neighbor values, emphasizing the difference between a pixel and its neighbors — many reference kernel values for common effects are documented in SVG filter tutorials.
Is feConvolveMatrix supported consistently across modern browsers?
Support exists across major browsers, though as a more complex, computationally intensive primitive, it's worth testing the specific effect and performance across your target browsers before relying on it heavily.
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