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Re: [OM] Scanning and File size mystery

Subject: Re: [OM] Scanning and File size mystery
From: frieder.faig@xxxxxxxxxxxxxxxxxxxxxxxxx
Date: Tue, 7 Nov 2000 02:52:46 +0100
On Mon, Nov 06, 2000 at 03:50:30PM -0500, DAVDOU9211@xxxxxxx wrote:
> 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.

Are you using any filters like blurr? I once heard that the compression ratio 
of the jpeg algorithm
increases when the amout of detail information is decreased. This is what 
happens when you`re
electronically 'bookehing' the background.

Frieder Faig


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