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Low Pass Filter

Apply low pass filter to smooth images and reduce noise with adjustable blur algorithms

Click to upload file or drag and drop file here

Maximum file size: 20MB Supported formats: image/jpeg, image/png, image/webp, image/gif, image/bmp, image/tiff

Upload any image file (JPEG, PNG, WebP, GIF, BMP, TIFF) to smooth and reduce noise

Choose the blur algorithm. Gaussian works well for most images

0.1 1.5 20

Radius of the blur effect. Higher values create stronger smoothing

0.1 0.4 3

Strength of the blur effect. Higher values apply more aggressive smoothing

Number of blur passes. More iterations = smoother result

Maintain edge detail while smoothing flat areas

Choose which color channels to process

Choose output format or keep original. PNG recommended for maximum quality

Output quality for lossy formats (JPEG, WebP). Higher = better quality but larger file size

Key Facts

Category
Design
Input Types
file, select, range, number, checkbox
Output Type
file
Sample Coverage
4
API Ready
Yes

Overview

The Low Pass Filter tool allows you to smooth images and effectively reduce digital noise by applying customizable blur algorithms. Whether you need to soften textures, remove high-frequency artifacts, or create artistic blur effects, this utility provides precise control over the smoothing process.

When to Use

  • •To remove grain or sensor noise from high-ISO digital photographs.
  • •To soften harsh edges or textures in graphic design assets.
  • •To prepare images for downscaling by reducing aliasing artifacts.

How It Works

  • •Upload your image file in any supported format like JPEG, PNG, or WebP.
  • •Select a blur algorithm, such as Gaussian or Surface Blur, to define the smoothing behavior.
  • •Adjust the radius, strength, and iteration settings to fine-tune the intensity of the effect.
  • •Choose your desired output format and quality settings, then process the image to download the smoothed result.

Use Cases

Denoising vintage or low-light photography to achieve a cleaner look.
Creating background blur effects for web design elements.
Softening skin textures or removing blemishes in portrait photography.

Examples

1. Reducing Noise in Night Photography

Amateur Photographer
Background
A photo taken at night has significant digital grain due to high ISO settings.
Problem
The image looks grainy and lacks professional clarity.
How to Use
Upload the JPEG, select 'Gaussian Blur', set the radius to 1.2, and process the image.
Example Config
algorithm: gaussian, radius: 1.2, strength: 0.4
Outcome
The image grain is smoothed out, resulting in a cleaner, more professional-looking photograph.

2. Softening Background Graphics

Web Designer
Background
A sharp, high-resolution background image is distracting from the foreground text.
Problem
The background needs to be softer to improve readability of the overlay text.
How to Use
Upload the image, select 'Surface Blur' to maintain some structure, and increase the radius.
Example Config
algorithm: surface, radius: 5.0, preserveEdges: true
Outcome
The background is effectively softened while retaining the main shapes, making the text much easier to read.

Try with Samples

image, png, jpg
Web Image Processing Python Samples
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preferred input family image
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image
Windows Image Processing C++ Samples
Windows C++ image processing examples including reading/saving images, resizing, and format conversion using Windows Imaging Component (WIC)
preferred input family image
image
Web Image Processing Rust Samples
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preferred input family image
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FAQ

Which blur algorithm should I choose?

Gaussian Blur is the standard choice for general smoothing. Use Surface Blur if you want to smooth flat areas while preserving sharp edges.

Can I process multiple images at once?

No, this tool is designed to process one image file at a time.

What is the purpose of 'Blur Iterations'?

Increasing the number of iterations applies the filter multiple times, resulting in a significantly smoother and more pronounced effect.

Does this tool support transparency?

Yes, if you upload a PNG or WebP file with transparency, the tool will maintain the alpha channel in the output.

What is the maximum file size I can upload?

You can upload image files up to 20MB in size.

API Documentation

Request Endpoint

POST /en/api/tools/image-low-pass

Request Parameters

Parameter Name Type Required Description
imageFile file (Upload required) Yes Upload any image file (JPEG, PNG, WebP, GIF, BMP, TIFF) to smooth and reduce noise
algorithm select No Choose the blur algorithm. Gaussian works well for most images
radius range No Radius of the blur effect. Higher values create stronger smoothing
strength range No Strength of the blur effect. Higher values apply more aggressive smoothing
iterations number No Number of blur passes. More iterations = smoother result
preserveEdges checkbox No Maintain edge detail while smoothing flat areas
channels select No Choose which color channels to process
format select No Choose output format or keep original. PNG recommended for maximum quality
quality number No Output quality for lossy formats (JPEG, WebP). Higher = better quality but larger file size

File type parameters need to be uploaded first via POST /upload/image-low-pass to get filePath, then pass filePath to the corresponding file field.

Response Format

{
  "filePath": "/public/processing/randomid.ext",
  "fileName": "output.ext",
  "contentType": "application/octet-stream",
  "size": 1024,
  "metadata": {
    "key": "value"
  },
  "error": "Error message (optional)",
  "message": "Notification message (optional)"
}
File: File

AI MCP Documentation

Add this tool to your MCP server configuration: 

{
  "mcpServers": {
    "elysiatools-image-low-pass": {
      "name": "image-low-pass",
      "description": "Apply low pass filter to smooth images and reduce noise with adjustable blur algorithms",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=image-low-pass",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

You can chain multiple tools, e.g.: `https://elysiatools.com/mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp`, max 20 tools.

Supports URL file links or Base64 encoding for file parameters.

If you encounter any issues, please contact us at [email protected]