File Size is not the original when auto importing

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  • Updated 3 months ago
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I just noticed that the auto import of iOS Lightroom CC somehow recompresses the photos instead of just import them. 
I just impoted some photos from an SDCard to my iPhone and in Photos (and if I export the photo as unmodified) it has 11.2Mb and under Lightroom CC the same photo just have 10.57.
Even worse for photos edited under Photos app or any other that write non destructive edites, Lightroom imported the picture with 5.1Mb, if I export the photo from photos with full size and max quality, it has 12Mb!

Any idea how and how to import the full size?

Also why the import won't import also any keywords the photo has assigned? That would help a lot my change from apples Photos to Lightroom CC
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Marco Martins

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Posted 3 months ago

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Rikk Flohr, Official Rep

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The difference you are seeing between 10.57 and 11.2 is the result of the difference in the way a kilobyte is computed. 1000 vs 1024. See this article for more information: https://en.wikipedia.org/wiki/Kilobyte
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Rikk Flohr, Official Rep

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As the original is uploaded directly  (file copy) and no translation of any kind occurs, the file sizes are the same.
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Rikk Flohr, Official Rep

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Reedited photos with different JPG compressions available make it possible for any derivative files to be smaller or larger than the original. This is true of all software. 
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Marco Martins

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If the original file has 11.2Mb and on Lightroom it is 10.57 that is not true, file sizes are not the same.

regarding edited files: so how does Lightroom exports the photo from the photos app? It must select some kind of export to import the photo with the edits 
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Rikk Flohr, Official Rep

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Marco,

It is the same original file. It is copied one place to another. 
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Marco Martins

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if so why does it gets smaller?!
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Johan Elzenga, Champion

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What type of image to you use? If you shoot in Apples new HEIC format, then maybe the photos do indeed get re-rendered. I would not worry too much about file sizes, however. If you shoot in a compressed file format, then these sizes say little about the image quality.
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Marco Martins

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I use a mix of Jpeg from my fuji and HEIC, if my photos are taken in portrait mode Lightroom imports them in jpeg, but if it is a regular one it accepts the HEIC, but this differences I am talking about are in jpegs from my fuji.
In a HEIC file photos reads 1.4Mb and Lightroom CC 1.31
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Johan Elzenga, Champion

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So are you seeing quality differences or is this just an academic interest? A jpeg file saved in quality 12 (Photoshop) is much larger than when saved in quality 10, but it is very unlikely that you will see the difference.
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Marco Martins

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TBH on a quick compare I cannot see any difference, but I did not zoomed, cropped etc. 
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Antoine Hlmn

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However (!!) when using the photoshop app on iPad, the image is compressed. Am I right?
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Marco Martins

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I don't have an iPad, so I don't know :(