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Grey areas in image
JPEG data interruptions lead to grey areas in the image. These errors can be recovered, if the data stream was only interrupted, but not totally lost. If the data is completely lost, usually the image can be recovered in smaller resolutions, at least.
Damaged colors in image
Small bit errors in a JPEG scan lead to image disruptions. Most parts of the image are available, but they are shifted and have wrong colors. Depending on the severity of the damage, these errors can be repaired.
Wrong colors in image
As the the color components of a JPEG file are decoded incremental, data errors may result in colors that can not be displayed any more within the according color space. Depending on the severity of the damage, these errors can be repaired.