Layered PSD file smaller than unlayered file


i have been doing tests minimize file size. thought strange layered rgb 16-bit psd file (one curves layer) smaller same file when flattened. normal? should case?

 

i'm running cs6 on intel imac under osx 10.6.8.

i can imagine happening when flattening of file causes curve transform pixels in way can't compressed efficiently layered file.  remember psd files have non-lossy compression.

 

what differences talking here, specifically?



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