You know you can export Revit views/sheets as TIFF direct from Revit?
And im not sure what you mean by "EVERYTHING that comes out of R15 is not legible in On-Screen"? Can you elaborate on this please.
Revit outputs are only really as good as YOU make them. If you put in rubbish you get out rubbish. And, that is a strange method for take-offs. There are MUCH faster more efficent ways of getting take-offs from your BIM projects.
The fact is that we have done this process with every Revit version, until this newest 15. I tried direct tiff conversion of course but didn't look good on On-Screen.
DWF looked fairly good, but compared to PDF export, the multi-sheet export feature (i.e. getting 10 different pdf's from 10 different Revit sheets at the same time, instead of 1 pdf containing 10 pages) gets lost.
Tiff's llok blurry, almost not legible. And funny thing... it only happens with our Revit 15, I just wanted to narrow down the root of the problem, everything seems to point at Revit 15
I don't which file do you want to convert TIFF to. But you can check this tiff converter, which allow convesion among excel, Word, pdf, tiff and raster images.