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Re: filmscanners: File format

I tried it with ten iterations in PSP7, and saw no visible
degradation, so my finding was different from Henk's.

Attached: two 6K jpeg clips of a bit of lace, clipped out of
400x250  29K clips  from an original 2700 dpi scan.

The first is a clip from a PSP7 '15%' jpeg photograph,
resaved once as
'10%'  jpeg, and the other is the same clip closed, reopened
and resaved 10 times. Note that the file sizes aren't
significant, because I failed to crop them to exactly
the same size.

I suspect it might be a different story if the image had
been edited slightly between each iteration, because then
the jpegging couldn't repeat itself exactly. I haven't tried
that experiment yet because I can't think of a standardised
bit of editing to do each time. Any suggestions?


Alan T

----- Original Message -----
From: Laurie Solomon <laurie@advancenet.net>
To: <filmscanners@halftone.co.uk>
Sent: Friday, March 30, 2001 5:51 PM
Subject: RE: filmscanners: File format

> Out of curiosity, how many timed did you do this and what
sorts of changes
> did you see?  Have you tried the same experiment using
another image editing
> program to eliminate the possibility that it might be more
a by-product of
> what PSP is doing than what is generic to JPEG
> -----Original Message-----
> From: owner-filmscanners@halftone.co.uk
> [mailto:owner-filmscanners@halftone.co.uk]On Behalf Of
Henk de Jong
> Sent: Friday, March 30, 2001 12:59 AM
> To: filmscanners@halftone.co.uk
> Subject: Re: filmscanners: File format
> I just did a test.
> Opening and saving the same .jpg file in PSP over and over
without changing
> anything.
> Every step the picture is changing a little bit...
> __________
> hsdejong@worldmail.nl
> Homepage Nepal - Trekking Around Annapurna - Photo
> http://annapurna.wolweb.nl

Attachment: lace1s.jpg
Description: TIFF image

Attachment: lace10s.jpg
Description: TIFF image


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