rotating jpg files?

when i rotate images taken with my digital camera (JPGs) for 90 deg. and save then they become smaller. i suppose they lose quality. for example, if original file is 500KB then rotated one becomes 170KB. So, my question is: how to rotate JPG without loosing any quality(file size)? i tryed with ACDSee and Photoshop, but the same problem occurs.

Thanks in advance.
kzdownAsked:
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weedConnect With a Mentor Commented:
Not without losing quality.
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webwomanCommented:
Sounds like you're changing the size when you rotate it or dropping the resolution. Don't.
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weedCommented:
When you change a JPEG, then save it, youre saving as a JPEG again and hence recompressing it so youre losing quality regardless of what you do. You need to save it in a format that is uncompressed.
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kzdownAuthor Commented:
weed, can you  tell me detailed instructions how to do it?

thanks
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weedCommented:
Nothing complicated. Open the JPEG, rotate it, save it as a TIFF or any other uncompressed format instead of a JPEG.
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kzdownAuthor Commented:
but i need final result in jpg. tried to save to tiff (uncomeressed) first and then to jpg, but got same results..
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weedCommented:
If you resave as JPEG youre losing quality. Thats the hard truth.
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kzdownAuthor Commented:
so there is no way to do it. right?
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webwomanCommented:
Unless you're using a really compressed jpg, you shouldn't lose THAT much quality. And if you're not resizing it in some way, it really shouldn't be THAT noticeable.

What size are they to start, what size when you finish, what resolution? If you're ENLARGING them, or upping the resolution, that will most definitely make them horrible quality. And if you're resizing them down a lot, they'll lose detail because you won't have enough pixels to show it.
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kzdownAuthor Commented:
no. 500KB start after rotation and saving,without any other action they become about 170KB.

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dkern18195Commented:
The best solution I've found for not losing any quality in jpg rotation is to save the file as a tiff or psd file immediately upon opening it.  Then you can do whatever manipulation you need and when done you can save it as a .jpg at whatever compression ratio you need.
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