What is the best file type to scan printted drawings? Tiff or Gif?
400 DPI is a standard in monochrome large format plotters. The last 10 years, almost all large format monochrome plotters (xerox,KIP,Oce,MITA etc..) work at 400 DPI. Becuase of this 400 DPI was the "standard" scan resolution. Now there are some newer models that also works at 600 DPI, however, almsot everything in monochrome is scanned at 400 DPI. In monochrome scans, you can save the TIF with G4 compression, that is very high compression. Depending of the original, a TIFF-G4 file (A0, 400 DPI) in some cases is just a few hounderd Kb ! (I have seen TIFF-G4 files, that are smaller then the original DWG file.) In one company where we did a large TIF archive, they scanned about 1 Mio large format documents and saved as TIF-G4 (400 DPI). At the end, they calculate the space, and it was about ~1MB/File ! So not really a lot. In color, 300 or 400 DPI is the standard for line-drawings. This is high, however, if you have line-art you need min. 300 DPI, if you use less, you loos quality in Lines/Text. And many large format color-scanners has 300 or 400 DPI physical reolution. Regards Toni
All, We set our standard for scanning at 400 DPI as well. The main reason was the desire to capture some hand lettering at 1/16" that was lost at any lower resolution. It was much easier to settle on a single standard for everything than to maintain seperate ones. 400 DPI seems to capture everything that we have in the archives that was hand drawn. bobb
I used to run them at 200 and 300 but found with the speed of today's CPU's and the loss of info at lower res, 400 is the best on monochrome scanners. the desire to capture some hand lettering at on a single standard for everything than to in the archives that was hand drawn.
Thanks to everyone. -- Rodney McManamy President CADzation www.cadzation.com AcroPlot - The easy way to convert multiple AutoCAD and Word files to PDF.
