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Re: [OM] Scanning Res for Web

Subject: Re: [OM] Scanning Res for Web
From: "C.H.Ling" <pling@xxxxxxxxxxxxx>
Date: Tue, 30 Nov 1999 21:58:22 +0800
I second it, the LZW compression is just not work for me, it only work for 1 bit
graphics. For most photo the size reduction is very little and I have tried to
compress some 16 bit gray photos, all the size were 20% larger, just crazy! It
also slow down my machine a lot, since I only got 128MB ram and 200MMX processor
not like some of you got 384MB ram and 500MHz Pentium III.

C.H.Ling


>
>
>On Mon, 29 Nov 1999, Dave Bulger (quoting Joel) wrote:
>
>> From your note below, can I assume that TIF files with LZW compression don't
compromise the image at all?  I.e. like JPG compression...
>>
>> 1) Scan at 2700 ppi (or high as possible)
>> 2) Save original image as .tif file at 2700 ppi with LZW compression on
>
>
>LZW is indeed a lossless compression scheme, however, I have found that
>with scanned photographic images it doesn't work very well at all.
>There's no quality loss but I've found that the resulting files actually
>get *bigger* as often as they get smaller, and that any reduction you do
>get is not worth the extra processing overhead to decompress the
>"compressed" data.
>
>Using TIFF without any compression gives about the same average file
>size with much quicker load times, IME.
>
>Try it, you'll see.
>
>--
>________________________________________________________________________
>*             |                                                        |
>|  /  | |/-\  |                      Ian A. Nichols                    |
>| |   | |   | |                                                        |
>|  \-/| |  /  |                  i.a.nichols@xxxxxxxxxx                |
>|             *                    iann@xxxxxxxxxxxxx                  |
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