 BetterPhoto Member |
JPEG: Generation Loss? A friend told me that if I copy images from memory card to computer and then write to cd / dvd, it will cause generation loss and, not only that, the same thing if I review images on the camera back (camera Lcd). Is that true? Thanks.
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John P. Sandstedt |
If you upload your JPEG images from camera or memory to computer and then copy [write them] to CD/DVD, there will be no loss of quality. If you edit JPEGs, there is the probability of quality loss - it's the nature of the JPEG format. There will be no loss of quality of Raw files because, for all practical purposes, there's no way to edit them and save them in the Raw file format. Normally, you'd change the format to JPEG, TIFF or DNG.
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Jon Close |
Ditto. MOVE or COPY = no loss. OPEN and CLOSE w/o changes = no loss. OPEN and SAVE = compression and losses even if no changes are made.
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Roy Blinston |
One cause of potential loss of quality is if one edit's the pics then re-saves them at a different quality setting. This can happen if people are not aware of what they are doing with the quality dialogue boxes. If your original pic is say 3000 x 2000 pixels at JPEG high, you open it, make some tweaks or edits, then save it at a different level to what you originally had (ie: 1500 x 1000 pixels). Some people do not even look at the quality settings box.
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Jerry & Karen Bengtson |
Any time you open your JPEG image and resave the image, you will lose quality. But it takes about 10 times before you can start to see the difference. But I recommend you save your files as TIFF or PSD files while editing the files, then save them as JPEG for printing.
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Phillip A. Flusche |
From the first answer by John S., you are completely wrong. You can edit RAW files and then to save them still in RAW format. I use Nikon's NX2 or NX1 editing programs and I edit all my RAW files save them in RAW(NEF) format, i.e. Nikon's NEF format. These files are saved in a completely non-destructive manner so that I can go back to either last saved copy or even to the original file and start over anytime I want. Once I have the file edited in NX and if I was not able to accomplish all that I want, which is rare, I can then directly open up the file directly from NX to Photoshop. It is converted to TIF by NX with no loss of data before it ever opens in Photoshop. For all you Nikonians out there try NX2 for free for 60 days (www.nikonmall.com) and see what I am talking about. Photoshop can't even come close to the basic editing capabilities of NX2 for RAW files.
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