RE: File Size Reduction by Hiding Layers

i've come across trick of hiding layers reduce file size, wondering happening.

 

here's situation.

20.6mb psd

hiding layers reduces file 13.1mb

 

 

i've been told file reduction because preview images no longer being generated.

 

could preview images accounting 40% of file size?

to test saved file jpg @ 100% quality (not web) , yielded 1.34mb file.

this leaves me 6.6mb of file reduction unaccounted for.

 

is else being siltently compressed/compatibility settings not included/other info being excluded file when layers hidden?

 

 

note:

i need make sure files have maximum compatibility opening them in lightroom , other programs open psds painter - compatibility settings important.

i need make sure still setup print , no compression ocurring.

 

 

could please tell me excluded file lower file size 40% when hiding layers?

thanks!

when 'hiding' layers--do mean 'unchecking' layers check box in save dialog? or turning layers off?

 

i did test--file 2 layers saved psd layers check box checked , 1 layer turned off--file size same both layers turned on--saving 'layer' check box unchecked , 1 layer turned off--file size half (off course no longer has layers).

 

the jpeg irrelavant jpeg can't have layers!

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