from here (image source) |
You wouldn't think it was hard to cover up details but hiding details in documents, pictures, and video seems to be something that a lot of people actually do have difficulty with. Even without the reflection, the pixelation can actually be reversed. You might think it would be easier to just place a big black box over things, but even that can be problematic in things like PDF documents because you have the ability to highlight the covered text and read it.
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