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Open Reg-suit’s HTML report, verify that it compares the intended baseline with the current screenshots, then inspect each changed, new, or deleted item against the change the pull request is meant to make. A reported difference is a signal for human review—not proof by itself that the change is a bug or that a test has failed.
1. Confirm the report compares the right snapshots
Reg-suit’s workflow fetches expected snapshots with sync-expected, using the configured key-generator and publisher plugins to select them. The compare command compares those fetched images with images in actualDir and generates an HTML report. If configured, publish can send the result and current images to external storage. Check that the expected snapshot represents the intended comparison point before judging any visual change. Reg-suit’s repository and configuration documentation describes these commands and settings.
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Baseline selection is especially important in branch-based workflows. The project site describes a GitHub flow that selects the topic branch’s parent commit as the expected snapshot. If the report is comparing against a different point, a valid change may look unexpected—or a relevant change may be absent. The project site describes the flow and report publishing.
2. Check whether a baseline existed
On a first run, there may be no earlier snapshot to compare. In the official demo, the image is therefore classified as new; after publishing, that snapshot becomes the expected image for the next run. Treat a first-run “new” item as an initial capture, not as a regression against a baseline that was never present. The official demo illustrates this first-run behavior.
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- Universal Compatibility: Designed for use with any screen, this all-in-one visual acuity chart does not require a computer. Suitable for all monitors, it's compact and easy to install. Supports HDMI connection for direct plug-and-play use.
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3. Review changed, new, and deleted items
- Changed: Inspect the affected region in the current image and compare it with the expected image. Ask whether the difference matches the intended code or design change.
- New: Determine whether the screenshot is newly added to the test set, or whether the baseline is missing or selected incorrectly. A new item is not automatically a defect.
- Deleted: Check whether the page or screenshot was intentionally removed, renamed, or excluded, and whether that removal is expected for this pull request.
For each item, assess the visible region in context: confirm the intended element changed, and look for nearby unintended changes such as shifted content or missing interface elements. The report helps locate differences; the reviewer decides whether they are expected. The official demo describes detected differences as a reason to review, not an automatic failure. Read the demo’s report explanation.
4. Interpret small differences using the comparison settings
Before treating a small or noisy change as meaningful, check the configuration used for that report. Reg-suit settings can affect what is reported or considered significant:
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thresholdRateis the ratio of differing pixels to the whole image. Its documented range is 0–1.thresholdPixelis an alternative absolute threshold for the number of differing pixels.matchingThresholdcontrols YUV color-distance matching from 0 to 1; smaller values make comparison more sensitive.enableAntialiasenables detection and ignoring of anti-aliased pixels.- The optional
ximgdiffsetting can add detailed information to the HTML report. Its engine describes structural information, such as image parts that were inserted or moved.
These options are not interchangeable: rate and pixel thresholds express different quantities, while color matching and antialias handling affect how pixels are compared. Review the values actually configured for your project rather than assuming a report uses defaults. Settings and plugin options may change; consult the current Reg-suit configuration documentation for implementation details.
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When a publisher plugin is configured, the report and snapshots may be available in external storage. Optional notifier plugins can surface results through GitHub commit status or pull-request comments, GitLab merge-request comments, Slack, or Chatwork. A notification helps you find a result; it does not replace opening the HTML report and checking the images. The available integrations depend on the project’s configuration. Reg-suit’s project site describes report storage and integrations.
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6. Decide whether to approve, investigate, or update the baseline
- Approve the visual change when the changed regions match the intended work and the relevant new or deleted items are explained.
- Investigate before approval when the baseline is uncertain, an unexpected region changed, or the difference cannot be explained by the pull request.
- Update the expected snapshot only after review when the visual change is intentional. Publishing makes the captured image available as an expected snapshot in the demonstrated workflow; do not use a baseline update to hide an unexplained difference.
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Reg-suit is for comparing test snapshots against baselines. If you instead need to capture a page for a review or debugging workflow, ScreenshotNeo offers a one-request screenshot API and an MCP server for AI agents. A screenshot capture does not replace Reg-suit’s expected-versus-actual comparison.
For example, this cURL request saves a page capture as WebP:
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