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Image Difference

Calculate the difference between two images to identify changes or create comparison masks

Click to upload file or drag and drop file here

Maximum file size: 10MB Supported formats: image/jpeg, image/png, image/webp, image/gif, image/bmp, image/tiff

First image for comparison

Click to upload file or drag and drop file here

Maximum file size: 10MB Supported formats: image/jpeg, image/png, image/webp, image/gif, image/bmp, image/tiff

Second image for comparison

How to calculate the difference between images

Output format for the result image (PNG recommended for accuracy)

Output quality for lossy formats

Key Facts

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

Overview

The Image Difference tool allows you to precisely compare two images to detect subtle changes, identify visual discrepancies, or generate comparison masks by calculating the pixel-level differences between files.

When to Use

  • •Detecting visual changes between two versions of a design or UI mockup.
  • •Verifying that image processing or compression has not introduced unwanted artifacts.
  • •Creating masks to isolate specific differences between two nearly identical images.

How It Works

  • •Upload your original image as the first file and the modified version as the second file.
  • •Select a difference mode such as 'Absolute Difference' or 'Highlight Changes' to define how the output is generated.
  • •Choose your preferred output format and quality settings, then process the images to view the resulting comparison file.

Use Cases

Quality assurance for graphic designers verifying exported assets.
Software testing for UI regression to ensure interface consistency.
Forensic analysis to identify hidden edits in digital images.

Examples

1. UI Regression Testing

Frontend Developer
Background
A developer needs to ensure that a recent CSS update did not accidentally shift elements on the landing page.
Problem
Manual visual inspection is prone to error and cannot detect pixel-perfect shifts.
How to Use
Upload the 'Before' and 'After' screenshots of the webpage and select 'Highlight Changes' mode.
Example Config
differenceMode: highlight, format: png
Outcome
A generated image clearly highlights the shifted elements in a contrasting color, making the regression immediately visible.

2. Design Asset Verification

Graphic Designer
Background
A designer is checking if a compressed version of a logo retains the same visual quality as the original high-resolution file.
Problem
Compression artifacts are often too subtle to see with the naked eye.
How to Use
Upload the original PNG and the compressed version, then use 'Absolute Difference' to see where data loss occurred.
Example Config
differenceMode: absolute, format: png
Outcome
The tool generates a map showing exactly which areas of the image were affected by the compression algorithm.

Try with Samples

image, png, jpg
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Web Image Processing Rust Samples
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macOS Image Processing Objective-C Samples
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FAQ

What file formats are supported?

The tool supports JPEG, PNG, WebP, GIF, BMP, and TIFF formats.

What is the difference between Absolute and Highlight modes?

Absolute Difference shows the mathematical variance between pixels, while Highlight mode emphasizes specific changes for easier visual inspection.

Is there a file size limit?

Yes, each uploaded image must be under 10MB.

Which output format should I choose?

PNG is recommended for the highest accuracy, as it is a lossless format that preserves the integrity of the comparison result.

Can I compare images of different dimensions?

For the most accurate results, it is recommended to use images of the same dimensions to ensure pixel-to-pixel alignment.

API Documentation

Request Endpoint

POST /en/api/tools/image-difference

Request Parameters

Parameter Name Type Required Description
imageFile1 file (Upload required) Yes First image for comparison
imageFile2 file (Upload required) Yes Second image for comparison
differenceMode select No How to calculate the difference between images
format select No Output format for the result image (PNG recommended for accuracy)
quality number No Output quality for lossy formats

File type parameters need to be uploaded first via POST /upload/image-difference 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-difference": {
      "name": "image-difference",
      "description": "Calculate the difference between two images to identify changes or create comparison masks",
      "baseUrl": "https://elysiatools.com/mcp/sse?toolId=image-difference",
      "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]