> Is there a way to get the potential file size of an image extracted from a
> PDF without writing it out?  
No, the file size depends on the following parameters (and perhaps others I 
forgot in my list):

- file format
- compression
- compression level
- resolution
- page size

Especially the compression part varies the file size. The only way to predict 
the potential size is not to use any compression, but I guess you don't want 
that, do you?

BR
Andreas Lehmkühler

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