Rotate JPEG's without quality loss

[The Old Fart]

I'm told that if I rotate a JPEG image using XP that I get a loss off
quality. Is there some other way to rotate these pictures without loss?

 

[C A Upsdell]

I'm told that if I rotate a JPEG image using XP that I get a loss off
quality. Is there some other way to rotate these pictures without loss?

Only if you rotate in multiples of 90 degrees. You can also crop JPEG
images losslessly. See the JPEGcrop program at:

http://jpegclub.org/

 

[Elmo]

I'm told that if I rotate a JPEG image using XP that I get a loss off
quality. Is there some other way to rotate these pictures without loss?

Every time you edit a lossy format, such as .jpg or .gif, then save
again, you lose more definition. What I do, when I can, is start off
saving a graphics file as a .bmp. I then edit and save as both a .bmp
and a .jpg. I then post the .jpg to the site I have in mind. If I want
to edit more, I open the .bmp, edit, then save as both .bmp and .jpg
again, and upload the new .jpg to the site. I would think that rotating
a .bmp 90 degrees wouldn't hurt its quality.

 

[C A Upsdell]

Every time you edit a lossy format, such as .jpg or .gif, then save
again, you lose more definition.

Usually you lose with JPG, but not always, as I pointed out in my
previous reply re JPEGcrop.

GIF is not lossy.

 

[Zilbandy]

GIF is not lossy.

But only supports 256 colors.

 

[C A Upsdell]

But only supports 256 colors.

To say a GIF is not lossy means that saving it does not degrade it: if
you try to edit it, you edit exactly what you saved. This is not true
(usually) of a lossy format like JPG, in which information is (usually)
lost each time it is saved.

(I say usually because of the exceptions you get with JPEGcrop, but
these are very special cases.)

 

[Zilbandy]

To say a GIF is not lossy means that saving it does not degrade it: if
you try to edit it, you edit exactly what you saved. This is not true
(usually) of a lossy format like JPG, in which information is (usually)
lost each time it is saved.

I thought you were suggesting using a gif format in place of jpg.
Sorry for the confusion. I've started saving all my originals in tif
format, but that sure eats up disk space. I guess that's the price you
pay for ultimate quality. :/ Right now, I have a mix of tif, bmp, and
pspimage formats.

 

[C A Upsdell]

I thought you were suggesting using a gif format in place of jpg.
Sorry for the confusion. I've started saving all my originals in tif
format, but that sure eats up disk space. I guess that's the price you
pay for ultimate quality. :/ Right now, I have a mix of tif, bmp, and
pspimage formats.

An alternative to TIF could be truecolor PNG: it is non-lossy, has
2**24 colours, and is compressed.