Re: rotating thumbnails

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I notice that the file size does NOT change at all after rotating a jpg file.
(WinXP) That seems strange. Seems if Windows opens the image file and re-saves
it that the file size would change.

DanR wrote:
> Thanks for the reply, Kenny. My WinME machine gives no warning about
> diminished quality and my WinXP in filmstrip mode does not warn me. I don't
> think the XP machine ever did warn me. I'm very cautious about resaving JPGs
> and It's unlikely I would have turned this off.
> But you answered my question. Thanks.
>
>
> Kenny S wrote:
>> by default xp warns you before jpg rotation that image quality may be
>> reduced.. but there is an option there that you can select to not show that
>> message again.. perhaps you did that so now you dont see the warning.
>>
>> Yes xp opens and resaves the image and quality is lost.
>> There is no way to adjust the quality.
>> there are some programs available that offer lossless jpg rotation like
>> acdsee (www.acdsystems.com)
>> . Or you can convert your images in to bmp or tif files that do not have
>> this problem since they are lossless formats
>> (this takes up more space... even though there is an option to use LZW
>> lossless compression in tiff files).
>>
>> kenny
>>
>>
>> "DanR" <dan@xxxxxxxxxxxxxx> wrote in message
>> news:u95%23v9IXFHA.2520@xxxxxxxxxxxxxxxxxxxxxxx
>>> WinXP and ME both have the ability to rotate pictures as you view them
>>> within
>>> their folder. This is nice for viewing pictures shot vertically. And I
>>> like the
>>> fact that the thumbnail is rotated. But... after rotating them they stay
>>> that
>>> way. My question is... how does Windows do this? If the picture is a
>>> jpg... is
>>> the picture opened (expanded) and then re-saved. If so is there generation
>>> loss?
>>> If so... how much? In Photoshop and other image editors I have a choice of
>>> the
>>> jpg quality when saving. What settings does Windows use when doing this in
>>> the
>>> background?
>>> I'm hoping that only some header information is changed. Does anyone know?


.

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