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[OM] Re: Photoshop Adjustment Layer versus file size

Subject: [OM] Re: Photoshop Adjustment Layer versus file size
From: "om2@xxxxxxxxxxxxxxxx" <om2@xxxxxxxxxxxxxxxx>
Date: Wed, 1 Jun 2005 10:03:20 -0400
In a PSD file, Photoshop only stores the settings for the adjustment layer.
As you can see, this file only increased a few percent with the addition of
an AL saved to a PSD file.  But the same file saved as a multi-layered TIFF
has separate copies of the image inside the file.  If you look save the
TIFF file with the "Layers" box ticked-off, you get zero increase in file
size, as all the layers are merged.

3-straight.tif  5.88MB
3-one-adj-layer.tif  10.29MB
3-one-adj-layer-flat.tif  5.88MB

3-straight.psd  4.43MB
3-one-adj-layer.psd  4.57MB

I save any file that I want to preserve as either/both a PSD, a TIFF, and
maybe a smaller-version JPG.  If there has been significant editing, then
the PSD file preserves all that work.  The TIFF is only archival.  I don't
think you have to worry about Photoshop not knowing how to read an old PSD
file for our lifetimes.  In any case, there will always be utilities to
preserve the file attributes, given the large installed base of PS users.

Skip

Original Message:
-----------------
From:  orava@xxxxxxxx
Date: Wed, 01 Jun 2005 11:17:43 +0300 (EEST)
To: olympus@xxxxxxxxxx
Subject: [OM] Photoshop Adjustment Layer versus file size




Hello all!

I am embarrased to admit that until yesterday I wasn't aware of one of 
Photoshops greatest tools: Adjustment Layers.

So far I have made all the changes in tiff-images that I have scanned from 
Provia 400. Now when I got to know adjustment layers I realised that there
is 
no need to make permanent changes in the files, only to add information 
concerning changes that will be made when I open the image in Photoshop
again. 
(This methods saves my images and I can make different versions of the same 
photo without losing quality.)


But now to my questions:

I am just wondering why does the file size double when I add an adjustment 
layer to the photo and save it as TIFF or PSD. I read from the web that 
adjustment layers shouldn't increase file size almost at all, but for me it 
really does! Could there be a certain setting that I should use so that
file 
size wouldn't explode in this way?

Do you find it safe to archive my photos (that include adjustment layers)
as 
TIFF or is it absolutely best way to save them as PSD? I am just thinking 
decades to come and I am absolutely sure that tiff will stay alive but I am
not 
100% sure about psd because I think it might be subject to changes...?


Thank!

Olli

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