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Windows 7: Why does the size of an image decrease with drag-moving?

15 May 2017   #1

Windows 7 Ultimate, 64bit
Why does the size of an image decrease with drag-moving?

Hello, I have found myself in a quite frustrating situation.

I have been sorting out my files and I noticed that some of the photographs decreased in size when I drag-moved them from the folder "My pictures" to another folder on my local HDD.

For example: One of the photographs used to be 5.18MB and is now 4.73MB. The resolution stayed the same: 6000x4000 and when I compare the photos (I did a back up before moving the files around) in windows photo viewer there is no difference whatsoever. Also when I check the colour graph in Adobe Lightroom there is no difference in files.

Why did the file size decrease? Should I be worried or is it possible that some useless metadata dissapeared when I drag-moved the photographs?

Thank you


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 Why does the size of an image decrease with drag-moving?

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