iPhone storage full? What to delete first
Empty Recently Deleted, then large videos, duplicates, screenshots and message attachments. The order that frees the most iPhone space with the least regret.
How does DustFox find blurry photos?
It measures sharpness with Laplacian variance: how strongly the brightness changes at edges. A crisp photo has sharp edges and a high score; an out-of-focus or shaken one has soft edges and a low score. The measurement runs on a 160-pixel grayscale copy of each photo, on the device.
Why is the threshold cautious?
Because deleting a good photo is worse than keeping a bad one. The cut-off was set so that sharp photos do not land in the list, at the cost of letting a few soft ones through.
Should I delete everything it finds?
Look first. Some blur is intentional: motion at a concert, a night scene, a child who would not stand still. The list is a shortlist, not a verdict. Everything deleted waits 30 days in Recently Deleted.
How is this different from choosing a keeper among duplicates?
Among duplicates, DustFox compares shots of the same scene with each other and measures the sharpest region of each frame, so a portrait with a soft background still wins. Blurry Shots asks a simpler question about each photo on its own.
