Search by images, including by altered forms of the images, can help in assessing of the images. The question here is: had anyone posted a form of the image? And the "Perceptual image analysis" extension can help to find out since when the images are online then.
* search by images even from private sites
* open-source tools for journalists
* part of perceptual image suite
谷歌浏览器、其他Chromium内核的浏览器
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