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Batch lossless JPEG rotation

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fishyweb

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I know that Irfanview will do lossless rotation on single images, but I think its batch rotation is not lossless. Also, I believe FinePixViewer batch rotation is not lossless.

So does anyone know how to do batch lossless JPEG rotation, (preferably with a free tool)?

--
fishyweb
http://www.pbase.com/fishyweb
Fuji S602 Zoom
 
fishyweb said:
I know that Irfanview will do lossless rotation on single images,
but I think its batch rotation is not lossless. Also, I believe
FinePixViewer batch rotation is not lossless.

So does anyone know how to do batch lossless JPEG rotation,
(preferably with a free tool)?

--
fishyweb
http://www.pbase.com/fishyweb
Fuji S602 Zoom
Click to expand...
Hi,

Try IrfanView T(humbnail) command, select pictures to rotate, then activate menu File - JPG lossless transform.... and wait till the process is done.

It helps to check the basic possibilities (i.e. menu entries) of a tool you are using....

Regards,
--
Janko
( http://www.pbase.com/janko/galleries )
 
Janko said:
Hi,
Try IrfanView T(humbnail) command, select pictures to rotate, then
activate menu File - JPG lossless transform.... and wait till the
process is done.
It helps to check the basic possibilities (i.e. menu entries) of a
tool you are using....

Regards,
--
Janko
( http://www.pbase.com/janko/galleries )
Click to expand...
How right you are. It's a shame that the help file doesn't include that technique. I will explore further!

Thanks. I am suitably admonished!

--
fishyweb
http://www.pbase.com/fishyweb
Fuji S602 Zoom
 
Select the images you want, right click and select rotate.

Morris
fishyweb said:
I know that Irfanview will do lossless rotation on single images,
but I think its batch rotation is not lossless. Also, I believe
FinePixViewer batch rotation is not lossless.

So does anyone know how to do batch lossless JPEG rotation,
(preferably with a free tool)?

--
fishyweb
http://www.pbase.com/fishyweb
Fuji S602 Zoom
Click to expand...
 
For the novices out here, what is "lossless rotation"?

Thanks in advance.
(Pazooter) said:
morris said:
Morris
fishyweb said:
I know that Irfanview will do lossless rotation on single images,
but I think its batch rotation is not lossless. Also, I believe
FinePixViewer batch rotation is not lossless.

So does anyone know how to do batch lossless JPEG rotation,
(preferably with a free tool)?

--
fishyweb
http://www.pbase.com/fishyweb
Fuji S602 Zoom
Click to expand...
Click to expand...
Click to expand...
 
JPG's use what is called a lossey compression algorythm. Translated, that means every time you save it to disk it loses some quality. The lossless rotation is a method of rotating the jpg image without loss of quality.

Pazooter
Kevin von Gillern said:
Thanks in advance.
(Pazooter) said:
morris said:
Morris
fishyweb said:
I know that Irfanview will do lossless rotation on single images,
but I think its batch rotation is not lossless. Also, I believe
FinePixViewer batch rotation is not lossless.

So does anyone know how to do batch lossless JPEG rotation,
(preferably with a free tool)?

--
fishyweb
http://www.pbase.com/fishyweb
Fuji S602 Zoom
Click to expand...
Click to expand...
Click to expand...
Click to expand...
 
Thanks for the explanation.
(Pazooter) said:
Pazooter
Kevin von Gillern said:
Thanks in advance.
(Pazooter) said:
morris said:
Morris
fishyweb said:
I know that Irfanview will do lossless rotation on single images,
but I think its batch rotation is not lossless. Also, I believe
FinePixViewer batch rotation is not lossless.

So does anyone know how to do batch lossless JPEG rotation,
(preferably with a free tool)?

--
fishyweb
http://www.pbase.com/fishyweb
Fuji S602 Zoom
Click to expand...
Click to expand...
Click to expand...
Click to expand...
Click to expand...
 
fishyweb said:
I know that Irfanview will do lossless rotation on single images,
but I think its batch rotation is not lossless. Also, I believe
FinePixViewer batch rotation is not lossless.

So does anyone know how to do batch lossless JPEG rotation,
(preferably with a free tool)?

--
fishyweb
http://www.pbase.com/fishyweb
Fuji S602 Zoom
Click to expand...
Actually, I just received a reply from Fuji claiming that FPV rotation is lossless. I did some testing yesterday that led me to conclude that it was NOT lossless e.g. the file sizes were smaller.

Can anyone verify this?

--
fishyweb
http://www.pbase.com/fishyweb
Fuji S602 Zoom
 
To expand just a little on Pazooter's quite accurate explanation, when a "lossless rotation" (or "lossless mirror") is done, the image data is not re-coded, thus avoiding the accumulation of compression impairments. All that is done is that an indicator in the JPEG header, telling about the orientation of the image, are changed. In effect, the header says, "Hey viewer software, YOU rotate the image you recionstruct from this data when you show/print it."

Incidentally, as I have discussed elsewhere, "lossless" is an unfortnate term, but it is consistent with the equally unfortnate "lossy compression", a term that never would have come into existence except that somebody thought "lossless" was a good name for the opposite genre of compression. The reality is that, for compression schemes such as JPEG, the decompression process at the receving end does not reconstruct exactly the orignal image data - just a set of data that describes an image that, hopefully, looks "almost exactly like" the original image to a human viewer. The term "lossy" implies that this difference is a "loss" of information. In fact, it is just a error to it. (If somebody writes my street address down wrong, he hasn't lost any information - just screwed it up!)

But of course I didn't get to name it!

Doug Kerr
 
To morris -- thanks for the answer.

For checking if FPV really did do it losslessly you can get a freeware tool at
http://www.mediachance.com/digicam/jpgq.htm

which will evaluate the image for quality. Just test the image before and after FPV rotation.

Pazooter
fishyweb said:
fishyweb said:
I know that Irfanview will do lossless rotation on single images,
but I think its batch rotation is not lossless. Also, I believe
FinePixViewer batch rotation is not lossless.

So does anyone know how to do batch lossless JPEG rotation,
(preferably with a free tool)?

--
fishyweb
http://www.pbase.com/fishyweb
Fuji S602 Zoom
Click to expand...
Actually, I just received a reply from Fuji claiming that FPV
rotation is lossless. I did some testing yesterday that led me to
conclude that it was NOT lossless e.g. the file sizes were smaller.

Can anyone verify this?

--
fishyweb
http://www.pbase.com/fishyweb
Fuji S602 Zoom
Click to expand...
 
mark,

I realized just after I posted that question it probably sounded dumb. (OH, NO, the Kiwi taste police will get me!).

I meant,

"I assume that "XP" refers to "Windows XP", but what functionality of it provides for modifying JPEG images". I have no experience with Windows XP.

You really should have something done about that nose!

Doug Kerr
 
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