vldmr, I thought about different lightning conditions, sure. But zour variant will cause reduction of the letters-size... That's not too good... The problem is, that in real life we don't look PDFs very often... So, it's needed only for some very special files...
The technology you are speaking about is used in ezPDF and suitable for columns... But not for the pages... Nevertheless, thanx, for your interest, maybe, somehow is't could be done.
javese, what do you think?