On 08/17/2009 11:33 AM, Monika Himpelmann wrote:
> Dear all,
> I have a question and maybe it is easy to answer and has been answered
> before although I didn't find it in the FAQ's.
> When I try to scale a foto in order to get it passport photo size it
> looses quality. The fotos I want to scale are of good quality but too
> large and are showing not only the head and upper chest of people but
> often more and so I have to cut them which is possible without any
> problem and then scale them in the format I need.
> I would understand the loss in quality if I would try to enlarge the
> fotos but making them smaller in size should not make them loose quality???
> Any hints from you out there?
> Thank you in advance for any answer.
> Best wishes
> Monika


I agree that it does not make sense to loose quality when scaling smaller.

The only thing I can think of is that if the photos are JPEG / JPG (or
some other "lossy" format then, *EVERY* time a photo is saved it looses
quality.  If somehow in the process you are saving it multiple times,
then you might loose quite a bit of quality.

With JPEG (that you want to keep as JPEG) that best method is probably
to make a copy of the file and then open the copy in Gimp.  Do all your
work on it (scaling, cropping, etc.) WITHOUT doing any saving until you
are DONE.  Then save it.  When you do that "save", select the highest
possible quality setting.

If in the future you have to open the file for some reason (for example,
printing) do NOT save it again in the process of closing it (unless you
have specifically made some change that you really intend to save -- but
understand you will lose some quality.

If that is not the problem, then the situation really does sound odd.

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