How do I stop visual monitoring flagging ads or rotating banners?
Draw ignore-zone rectangles on the screenshot so Lemwatch masks noisy regions (ads, timestamps, carousels) before comparing pixels.
Quick answer#
Open the monitored page, click Ignore Zones, and draw rectangles over noisy regions. Lemwatch masks those pixels black in both baseline and current screenshots before running the diff.
Common ignore targets#
Where to find it in Lemwatch#
Site → Visual Monitoring → <page> → Ignore Zones.
FAQ#
Do ignore zones survive layout shifts?#
Zones are pinned to CSS coordinates. Big layout changes may require redrawing.
Related#
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How do CSS selectors work in visual monitoring?
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What is the visual monitoring diff threshold?
Related Articles
How do CSS selectors work in visual monitoring?
Restrict visual monitoring to a specific region using a CSS selector so Lemwatch only diffs the part of the page that matters, like pricing or hero.
What is the visual monitoring diff threshold?
The diff threshold sets how much pixel change must accumulate before Lemwatch alerts — default 2% is right for most product pages.
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Pulse review queue, PII, and expected-behavior whitelist
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