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Shao
Joined: 28 Apr 2005
Posts: 3
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 Posted: Thu Apr 28, 2005 1:13 pm Post subject: Lossless JPEG |
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I read in the help (CS2) that Bridge can rotate the jpeg images without losing data. Can anyone confirm that this now is possible? Is it not possible from withing PS editor (would be strange)? |
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gbf1lm
Joined: 07 Feb 2005
Posts: 50
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| Posted: Thu Apr 28, 2005 1:16 pm Post subject: |
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everytime you save a jpeg, the quality goes down.
when you rotate in windows picture viewer or apple iphoto's browser. it rotates them and saves as a jpeg.
when you open up a photo in any photo editing program, its not saved untill you save it manually, and you can just at that point save as a tif. |
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Shao
Joined: 28 Apr 2005
Posts: 3
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| Posted: Thu Apr 28, 2005 2:17 pm Post subject: |
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Thx for your reply.
Sorry but your not completely right. Rotation of images (and saving them) is possible without loss of any data whatsoever. I've worked with Photoshop since version 1.0 and I'm a advanced amateur photographer since the 70's so I've tested most apps out there and atm have ACDSee 7 and EXIFER for lossless rotation of jpegs.
Saving as TIFF is always a good tip, yes.
If you read Adobe Bridge help you will find that they now claim that it can rotate jpeg without loss of data but I still want to hear if others have found this to be true and working and if it even works in PS editor. |
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gbf1lm
Joined: 07 Feb 2005
Posts: 50
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| Posted: Fri Apr 29, 2005 1:57 am Post subject: |
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| Shao wrote: | Thx for your reply.
Sorry but your not completely right. Rotation of images (and saving them) is possible without loss of any data whatsoever. I've worked with Photoshop since version 1.0.... |
isnt that what i said? a photo editing program is fine, but windows picture and fax view, and apples iphoto, is the problem.
and yes, jpeg out of the camera, saved as highest quality jpeg, looses data. save it as a tif once. then when your dont editing, jpeg is fine. you shouldnt edit a jpeg, unless that jpeg is out of camera. |
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Shao
Joined: 28 Apr 2005
Posts: 3
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| Posted: Fri Apr 29, 2005 8:18 am Post subject: |
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| gbf1lm wrote: | | Shao wrote: | Thx for your reply.
Sorry but your not completely right. Rotation of images (and saving them) is possible without loss of any data whatsoever. I've worked with Photoshop since version 1.0.... |
isnt that what i said? a photo editing program is fine, but windows picture and fax view, and apples iphoto, is the problem. |
I meant you are wrong about the saving bit. You CAN save a JPEG without losing data, it's only when data has been decompressed and then recompressed where data is lost. When adding, for ex., metadata, the JPEG data is not decompressed so the save will not alter the images data. |
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