10 Sep
2001
10 Sep
'01
9:05 p.m.
At 02:16 PM 9/10/01 -0700, you wrote:
This topic has gone over the list a few times, from
experience, the "best"
scans are 600 DPI black and white compressed into PDF files. This achieves
exactly what is needed, get the data without a lot of excess. The KA655 TM
that is on the DFWCUG site appears from the PDF to be 100 DPI/8 bit (note
that's 800 bits per inch net and the result is harder to read) I'll add
scanning this manual to my list. They don't appear to have come up with a
'standard' for their scans. That would help too.
--Chuck
I agree that 300 dpi @ 1bpp is superior for text and line art than 100 dpi
@ 8bpp, but I think your math is askew. You need to compare the # of bits
per sq in, not inch. So 100 dpi @ 8bpp is 10KB/in^2, while 300 dpi @ 1bpp
is 11.25 KB/in^2. For text and line art, though, the 1bpp image will
compress a lot better.
And if, for some reason, you want to scan line art and text in gray scale,
4bpp is plenty enough. Use 8bpp only for continuous-tone images.
-----
Jim Battle == frustum(a)pacbell.net