Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!hplabs!hpfcdc!hpgrla!jerryd
From: jerryd@hpgrla.HP.COM (Jerry Donovan)
Newsgroups: comp.text.desktop
Subject: Re: How big are scanned bitmaps and how small can they be made?
Message-ID: <7740003@hpgrla.HP.COM>
Date: 27 Mar 89 16:39:33 GMT
References: <3003@looking.UUCP>
Organization: Hewlett-Packard, Greeley, CO
Lines: 34

>>I would be interested in experiences people have had in scanning pages
>>of text or line drawings and reducing them.  Do people have any figures
>>
>>How small does a typical 8.5 by 11 page of stuff get when scanned at
>>300 by 300 and compressed?  I would guess 40K, but I would like to
>
>Define 'typical'.  An image I have here that is just few line drawings
>has these stats:
>			TIFF		TIFF		TIFF
>	   SIZE		NO CODING	PACKBITS	LZW
>figure	2271 x 2540	721,702		60,980		24,290
>	x 1 bit
>
>That seems to be close to your guesstimate when LZW is used inside
>the TIFF file.  But there really isn't much info in this drawing.

Yea, whatever typical means.  Out of curiosity, I took a paper I am
currently working on and scanned it as line art and checked file
size on the resulting images.  The paper was all text of mostly 8
pt size.  Counting the characters in one line and multiplying by
the approxamate number of lines says that the page contained about
2500 characters. I then ran both the compressed and uncompressed TIFF
images into PKARC to see what that program would do for the images.

No compression TIFF                    1053042 bytes
Compressed TIFF                         106828 bytes
PKARC (Squeezed) on Compressed TIFF     104912 bytes
PKARC (Crunched) on No compression TIFF  99502 bytes

Hope this helps.


Jerry Donovan
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