Digital BW, The Print

Hello,
I have a question. Why would my monitor calibration be always more accurate than my custom made printer profiles? 

I can't afford my own spectro for my printer, so have to get custom profiles.

My prints are invariably darker than my monitor when *I* print them, but when a commercial printer does them (eg for a commercial print run), the results seem to be more accurate re brightness, vis a vis my screen.

If it was just a problem with ambient light in my work room, the print results should be consistent whether I print them or someone else does it.

thanks,
Richard

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www.richardsmallfield.com 

   "One of the lessons of history is that nothing is often a good 
   thing to do and always a clever thing to say."
   --Will Durant.