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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.
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.
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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.
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:
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...
It seems the originals are zip-compressed, the resulting files aren’t.
This is quite shocking to me. At no point that I can consciously remember did I opt to ZIP these. That's something I've never included in my workflow ever, over the last zillion years.
This also explains the insanely long save-time required... <shaking my damned head 'til it hurts>
Good to learn something here, even after 20+ years w/PS. Question: Besides using either "save as" or "save a copy", is there a way to force the file to unzip itself when hitting the save button?
I have an entire folder of 140 files that I've been working on, each taking 3 minutes to save, which was just driving me cwazy and eating up so much of my time!!! I need to get these all unzipped so I can continue working.
Hoping there's a script or action (if the latter, probably using save-as) to get this systematic mistake corrected ASAP.
Thank you for catching this <shaking my head again!>
Question: Besides using either "save as" or "save a copy", is there a way to force the file to unzip itself when hitting the save button?
Not that I know of; I guess you could use File > Scripts > Image Processor to create copies without compression and replace the originals with those.
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)?
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«.