Quote:
Originally Posted by AnneWynne
every time you open and close a jpeg file you loose a little information (at least that is what I have been told)..
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Just to clarify, it's not every time you open and close, it's every time you open and
save. JPEG is a "lossy" format, meaning that when you save as a JPEG you're going to lose information from the original.
When you save as a jpeg, behind the scene, the program is compressing the image, removing any bits it can in order to reduce the file size without losing picture quality. While it's often unnoticeable to the human eye, if you blow the image up, you'll probably notice a difference, particularly in color gradients (the compressed jpeg will have a more noticeable "step" to the gradient than the original, uncompressed image has).