@mrfrankmrfrank @sebastiantombs That is an recent change in UI3.
It was done because deepstack can make annotations on a high-res JPEG file associated with the alert. Things like drawing a box around an object and labeling it "person 96%" or whatever. At the small size, these annotations were not typically legible. So now when
Blue Iris indicates it has a Hi-res JPEG file associated with an alert, UI3 will load that at full resolution instead of the smaller thumbnail when you mouse over the alert. This is configured in Blue Iris Camera Properties > Trigger. But perhaps deepstack integration can also cause these images to be created? I've never actually used deepstack.
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There are also some new settings related to the preview animation, including the ability to turn off the animation when a high resolution JPEG is found (in order to actually give the user time to read deepstack's annotations).
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If needed, I suppose I could add another setting that prevents the Hi-res JPEG from being shown at all, so the preview will just always be normal size.