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[OM] jpeg file size

Subject: [OM] jpeg file size
From: dtlocke <dtlocke@xxxxxxxx>
Date: Mon, 06 Nov 2000 20:35:16 -0600
Short answer:  Don't save the file as a JPEG after the scan, save it as a .tif 
(TIFF) file.  JPEG is a "lossy" format that discards information.  Save it as a 
JPEG last, after *all* editing in photoshop.  I have one of the "dummies" books 
on photoshop, and it does a pretty good job of explaining all this.

I've seen consecutive JPEG saves get bigger in photoshop.  Not intuitive, is 
it?  You may be saving with a high "quality".

-Dick
---->>>>>>
Something wierd is going on.  We are using a Plustek Flat bed scanner to scan
color prints for a family reunion project.  The prints are 4x6 and have been
scanned at 300dpi.   Following the scan the file is saved to disc as a JPEG
file.  We then export it to Adobe Photoshop to edit it, and then re-save it
again as a JPEG file.   At this point the file size is usually 350KB to
450KB.  Today, in the middle of the same work session, the file sizes in
Adobe began to be 2,700KB to 3,100KB.  We haven't made any changes in scan
size and are using the same basic editing steps.

It appears that something is happening to the JPEG compression.  Any ideas as
to what strange glitch could be causing this?  The larger file size impacts
storage for backup.

Dave Dougherty


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