Photoshop: Why my files saved from Photoshop bigger than the originals in Lightroom?

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  • Updated 4 years ago
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Photoshop CC 20141204.r.310 x64

From Lightroom, open a file thats c56MB
In Photoshop, duplicate layer - shows c112MB
Close, saving the file
OSX reports 176MB
Previous versions size in OS X would be as per Photoshop
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Stephen Leggett

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  • frustrated

Posted 4 years ago

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Chris Cox

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This could be quite normal depending on the exact file formats.

What is the original file format from Lightroom (probably a camera RAW file)?

Duplicating a layer in Photoshop means that you've at least doubled the amount of
data in the file (possibly more depending on the file format).

What file format are you saving the file as from Photoshop?
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Stephen Leggett

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Tiff to TIff; more than trebles - I now assume its storing the layers, a composite and more.

Just better buy bigger disks I guess :)
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Chris Cox

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Yes, by adding a layer in TIFF you basically now have 3 times the amount of data (original layer, second layer, composite flattened version) in the file. And the choices you make for compression in the TIFF file can greatly affect the size.