Photoshop ruler guides embedded in JPEG image?

I saved an image of an iPhone from Google and when I opened it in Photoshop, it had ruler marks set in place around the phone. I’ve never seen or even heard of such a thing before. I thought it was my doing at first but I re-opened the image again and the ruler marks were back.

How is it possible to embed ruler marks into a .jpeg image?

Answer

When an image is saved in Photoshop as .jpeg, .png, .tiff, etc. The file will also save the ruler (better known as “guides”) information within it. I think Photoshop saves that info in a small portion of the file called metadata if I remember correctly.

Attribution
Source : Link , Question Author : SaturnsEye , Answer Author : DᴀʀᴛʜVᴀᴅᴇʀ

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