How does this image comparison tool find image differences?

The tool performs a pixel by pixel comparison of the two images. If the color values (RGB) of corresponding pixels differ by more than the set 'Difference Threshold', that pixel is marked with the 'Highlight Color' on the output map. Otherwise, it's marked with the 'Background Color for Same Pixels'. It acts as an image difference detector.

What's the best 'Difference Threshold' for detecting image modifications?

It depends on your needs. For detecting very minor changes or compression artifacts with this photo diff tool, a low threshold (e.g., 10-30) is good. For finding more significant content changes and ignoring subtle lighting or encoding differences, a higher threshold (e.g., 50-100) might be better. Experiment to see what works best for your specific photo comparison task.

Is this tool an AI image comparison tool or does it use SSIM / image hash comparison?

No, this tool currently performs a direct pixel-by-pixel comparison based on color differences and a user-defined threshold. It does not use AI image comparison, Structural Similarity Index (SSIM image comparison), or image hash comparison methods. Those methods are often used for determining perceptual similarity, whereas this tool is designed to highlight exact pixel-level visual discrepancies.

Can I use this visual diff tool for comparing website screenshots or UI designs?

Yes, absolutely! This is an excellent image comparison tool for design and QA. You can take screenshots of different versions of a webpage or application UI, upload them, and quickly highlight any visual changes, making it easier to detect image modifications or regressions.

What if my images are different sizes for the image compare online process?

Our image comparison tool automatically resizes the second image to match the dimensions of the first image before performing the pixel difference detection. This ensures an accurate comparison. The output difference map (your image comparison report) will have the dimensions of the first uploaded image.

Does this tool offer side by side image comparison or image overlay comparison features?

This tool generates a single 'difference map' image where differing pixels are highlighted, rather than an interactive side by side image comparison or image overlay comparison with a slider. You see previews of your original images above the options, and the difference map clearly visualizes where changes occurred.

Is this free tool suitable for 'spot the difference' type tasks?

Yes, it can be used as a 'spot the difference tool' for digital images. By adjusting the threshold, you can make subtle differences more apparent on the generated difference map.