DEC scanned documents for Bitsavers (message for Al Kossow)

js at js at
Fri Apr 24 09:40:44 CDT 2015

On 4/24/2015 8:48 AM, Noel Chiappa wrote:
>      >  From: shadoooo
>      >  I'm scanning at 600dpi grayscale, lossless compression.
> I've been scanning a few things too, and I found that 600dpi grayscale
> produced absolutely enormous files (many, many MB's per page, for prints), no
> matter what I tried to do, compression-wise.
> 600dpi black and white, followed by saving as TIFF's with CCITT Group 4
> compression, produced immensely smaller files (small 100's of KB's for the
> same pages), and they are quite readable (even the fine letter seems to be
> readable - b/6 is quite distinguishable, etc).

While smaller, I've always found 1 bit 
b/w scans to be nightmarish to read (too 
much font detail is sometimes lost), and 
forget about grayscale pictures and 
diagrams coming across intact.  
Grayscale is best.  The problem comes in 
overdoing the DPI.  Even 90 dpi is good 
enough.  150, more that sufficient.  300 
or 600, total waste, but they are 
(obviously) the most accurate renderings.

- J.

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