DEC scanned documents for Bitsavers (message for Al Kossow)

[Lee Courtney]

I always scan to optimize OCR, that way the document will be found online
via  a search engine.

Lee C.

On Fri, Apr 24, 2015 at 7:40 AM, js at cimmeri.com <js at cimmeri.com> wrote:

>
>
> 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.
>



-- 
Lee Courtney
+1-650-704-3934 cell