I am making this post as response to this another [url]https://www.bungie.net/en/Forum/Post/139469138/0/0[/url]
In order to show if a photo is fake or not, one can use sites such as [url]http://www.izitru.com/upload.php[/url] or [url]http://fotoforensics.com/[/url]. There are many different methods but these are the most efficient as I'm not a tech god.
The link below this para is the "fake" image of Xur selling gally.( using izitru, as the OP I referred to has used fotoforensics)
[url]http://www.izitru.com/bhcot[/url]
The next link is an older photo, that has not been tampered with
[url]http://www.izitru.com/NnBEw[/url]
It cannot be determined if both of them are fake, why? Because neither are originals, instead they have been saved countless times as they been passed around the forums. This makes it much harder to asses its legitimacy. The issue is that we will never get the original photo of gally being sold, only the person who took the photo can prove this.( with the smallest possible percentage error.)
[u]Now I will tackle the images from OP's fotoforensics images[/u](which you can check out in the very fist link). The issues here is that he has misinterpreted the way in which ELA works, his only proof comes from comparisons between photos, however as these photos are not original nor has he provided proof that they are of the same quality( re-saving jpegs makes them lose quality). ELA is mean to highlight objects that have been added after the images was made. The link below both explains and demonstrates it.
[url]http://digiwonk.wonderhowto.com/how-to/photo-forensics-check-if-picture-has-been-photoshopped-not-0138649/[/url]
Then again, it may actually be fake, however I hope this post enlightens you so that you aren't some mindless drone with no critical thinking, and are actually informed. One should learn to asses things from afar, without going head fist into something.
Thank you for your time.
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No look at the galley pic (bottom left) not a big deal anyway
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JPEG images use a lossy compression system. Each re-encoding (resave) of the image adds more quality loss to the image. Specifically, the JPEG algorithm operates on an 8x8 pixel grid. Each 8x8 square is compressed independently. If the image is completely unmodified, then all 8x8 squares should have similar error potentials. If the image is unmodified and resaved, then every square should degrade at approximately the same rate. ELA resaves the image at a specified JPEG quality level. This resave introduces a known amount of error across the entire image. The resaved image is then compared against the original image. If an image is modified, then every 8x8 square that was touched by the modification should be at a higher error potential than the rest of the image. Modified areas will appear with a higher potential error level. Definitely looks like a fake image.