[filmscanners] Re: File size in PS?

["" <erik.kaffehr@swipnet.se>]

Hi!

It may happen that you are saving the image as 48 bits TIFF (16 bit/color) in
Photoshop but with 24 bits TIFF (8 bit/color) in vuescan. There is an option
in vuescan for 8 or 16 bit TIFF.

Hint: your scanner should give something like 30 Mbyte on 8 bits/channel and
double amount with 16 bits/channel.

Best regards

Erik

fredagen den 26 juli 2002 17.43 skrev du:
> Hi,
>
> At maximum resolution, single pass, my Minolta Elite II generates 35.MB
> TIFF file. If I open the above file in PS and do a "SaveAs"(with LZW
> compression), file size increases. I do not know why?
>
> Here are details.
>
> Vuescan file size- 35MB
> PS "SaveAs" with LZW - 56MB
> PS "SaveAs" without LZW - 66MB
>
> I looked at the Explorer/Properties/Summary for both Vuescan file & PS
> file. The changes are as follows.
>
> ****** Vuescan file summary (Looked using Explorer/Properties/Summary)
> ***** Compression-
> Lempel-Ziv with Tiff Horizontal differ...
> File size- 34.7mb
>
> *** PS "SaveAs" file summary (Looked using Explorer/Properties/Summary)
> **** Compression- Lempel-Ziv
> File Size- 66MB
>
>
> So the difference between the two is; PS uses Lempel-Ziv "Lempel-Ziv
> Horizontal differ..." compression while Vuescan follows "Lempel-Ziv"
> compression.
>
> I tried using VuePrint for compression, it reduced the 34MB file to around
> 20MB.
>
> My questions are
> a) Why the "SaveAs" in PS increses the file size?
> b) "VuePrint" for file compressses more than PS & "VueScan";  Does it mean
> "VuePrint" use latest LZW technology which PS6.0 does not implernent?
>
>
> Any thoughts about this is welcome. I do not worry about the price of the
> CDs but I worry about the numbers. Thanks
> Ramesh
>
> ********* I had sent this mail earlier, but it was not reaching the list;
> so sending it again **************************
>
>
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--
Erik Kaffehr                erik.kaffehr@swipnet.se alt. ekr@ksu.se
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S-611 66 Nyköping           +46 155 263515 (office)
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