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Old Jan 5, 2004, 7:11 PM   #1
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Default JPEG image degradation with simple rotation?

Being ignorant I would guess yes, even if virtually undetectazble.

Advice appreciated.
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Old Jan 5, 2004, 7:53 PM   #2
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Depends on the program. I have seen some that do introduce degradation and others that are able to do lossless rotations.
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Old Jan 5, 2004, 8:15 PM   #3
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Thanks, Michael.

How about Nikon View, Browser or Edit (6.01)?

IfranView (3.75)?

Dell Image Expert (3)?

-Brooke
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Old Jan 5, 2004, 8:54 PM   #4
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I am not certain about Nikon View or Dell Image Expert, nor IfranView (3.75). I do have IfranView 3.85, however, and if you click on the options menu, on it is a button for "jpg lossless operations." Clicking on that reveals, rotating, flipping, and other lossless operations. I am not certain if that is a default feature in the program or if it is a plugin I downloaded. On the Ifranview website is a plugin's link .... I downloaded the package and had installed them all.

Whatever program use though, I'd ensure that you did not do any of these operations on your originals ... copies only so that if the copy gets corrupt or whatever, you still have the original to go back to.
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Old Jan 5, 2004, 9:42 PM   #5
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Thanks, Michael. My IfranView has that option as well.

- Brooke
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Old Jan 5, 2004, 10:27 PM   #6
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Cool. Glad I could help.
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Old Jan 6, 2004, 2:57 PM   #7
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Nikon Browser (6) also can create lossless JPEG rotaions.

To me, this is very good news.
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Old Jan 9, 2004, 2:29 PM   #8
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Default degradation on rotation

As I recall rotating in Photoshop causes degradation but not in Nikon View 6. I don't know about Photoshop CS.
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Old Jan 9, 2004, 5:19 PM   #9
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Default JPEG image degradation with simple rotation?

xnview from www.xnview.com also has a quick lossless jpeg rotation tool. Like irfanview it overwrites the original file, so you need to back up carefully. It's also free, like irfanview.

Neither, so far as I can see will do a batch of lossless rotations, as required when you transfer a cardful to your computer with dozens of portrait format images on it. Irfanview will do rotations as a batch, but not, I think, with its *lossless* feature.
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