Quote:
Originally Posted by MattUK
It's more a case that every time a JPG is re-saved, it loses quality.
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Thats not strictly true... JPEGs will only discard data if you force them into either generating a new MCU, performing the discrete cosine transformation again or running their colour space conversion again.
In effect, if you open a JPEG and just save it, or save as, using the same packet settings it won't discard data.