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I’m confused about quality deterioration when repeatedly opening and "saving" JPEG images. I’ve read that every time a JPEG image is "saved," some quality is lost due to the lossy compression format.
My questions are….
1) What is meant by "saving" a JPEG image?
2) If I simply "open" a JPEG image in Microsoft Photo Editor, Adobe Photoshop CS or any other image editor, View the JPEG image and then simply exit out of viewing the JPEG, am I actually "saving" it again and therefore loosing quality?
3) If in Windows I right click on a JPEG and make a duplicate copy of the JPEG, is the copy (with a different name) "saved" and therefore the quality of the copy diminished.
4) If I open a JPEG in a photo editor and "save as" (instead of simply exiting) and use the same name as the JPEG I just opened, is the quality diminished?
When I do all of the above things, I don’t notice any decrease in quality and the JPEG seems to be exactly the same size so I’m guessing I haven’t degraded the original. If I’m wrong, I’m guessing I should make each JPEG file "read only" or burn them to a CD or DVD so they can’t be changed when I view them.
If I open up a JPEG in a photo editing program and make any changes to the JPEG at all, I can understand that the quality degrades. Any advice on my questions are appreciated.
My questions are….
1) What is meant by "saving" a JPEG image?
2) If I simply "open" a JPEG image in Microsoft Photo Editor, Adobe Photoshop CS or any other image editor, View the JPEG image and then simply exit out of viewing the JPEG, am I actually "saving" it again and therefore loosing quality?
3) If in Windows I right click on a JPEG and make a duplicate copy of the JPEG, is the copy (with a different name) "saved" and therefore the quality of the copy diminished.
4) If I open a JPEG in a photo editor and "save as" (instead of simply exiting) and use the same name as the JPEG I just opened, is the quality diminished?
When I do all of the above things, I don’t notice any decrease in quality and the JPEG seems to be exactly the same size so I’m guessing I haven’t degraded the original. If I’m wrong, I’m guessing I should make each JPEG file "read only" or burn them to a CD or DVD so they can’t be changed when I view them.
If I open up a JPEG in a photo editing program and make any changes to the JPEG at all, I can understand that the quality degrades. Any advice on my questions are appreciated.
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