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JerryandLoisPhotography
JerryandLoisPhotography
Known Participant
July 13, 2023
Question

Exported" layers to files" don't match original filesizes

  • July 13, 2023
  • 1 reply
  • 1071 views

Hello,

I need to better understand exporting layers to files.

Suppose I have source folder that has 4 TIFFs, no channels, no additional layers, none that are smart objects, etc. Boringly simple.
base.tif
xxx.tif
yyy.tif
zzz.tif

I create a stacked file with base as the bottom layer, and xxx, yyy, and zzz as the additional three layers.

Now I opt to export layers to files to a separate destination folder. No compression.

At the end I have 4 new files.

The filesizes are different (please see attached JPG), visually, the source and dest files seem to be the identical. In particular with my simple test:

Can I reliably expect that the destination files are the exact same as their sources, visually (not just by eye)?

Why would the destination files be a different size? I'm hoping the answer has to do with metadata, not the image data.
While the files I mentioned are simplified for testing purposes, I have real-world files whose sizes grow by 30% when I stack and then export them back out.


Thanks!!!

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    1 reply

    c.pfaffenbichler
    Community Expert
    c.pfaffenbichlerCommunity Expert
    Community Expert
    July 13, 2023

    In the screenshot it seems the exported images are smaller, not larger, in file-size than the originals, so please provide a meaningful set of images. 

     

    JerryandLoisPhotography
    JerryandLoisPhotographyAuthor
    Known Participant
    July 13, 2023

    As I said, the first case was with simplified files, to prove that output sizes don't match input sizes.

    For a real world example,  please see this dropbox link:
    https://www.dropbox.com/sh/i2pn42wsawmyr1q/AAB3o3xUMTw8HXYu-NNtd2Bna?dl=0

    AND - note the attached screen shot.  Highlighted file originals are each about 66mb, exported are 201mb.  Over 300% increased filesize.

    There's another issue - the source files, once modified, take a very very very long time for each to save, regardless of what kind of change was made.  The versions that were exported from a stack save in a short, reasonable amount of time.  I don't know why...

    Hoping for some insights...


    c.pfaffenbichler
    Community Expert
    c.pfaffenbichlerCommunity Expert
    Community Expert
    July 13, 2023

    Right - that's a tool I'd forgotten about.  Still blown away and glad for the explanation of the unbearable slow save times.

    Back to my original question:  filesizes of original vs. exported layer do not match.  Any insights on why this is, and is there any change to the actual image content (guessing this is a metadata related behavior)?

    Thanks!


    If I resave »0141-23-Fireworks-Bellevue-Jerry-and-Lois-Photography-TPAI.tif« without compression it seems to be 205,9MB, just like »OUTPUT-_0003_0141-23-Fireworks-Bellevue-Jerry-and-Lois-Photography-TPAI.tif.tif«. 

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