Quote:
Originally Posted by chris-p
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.
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Despite the rather odd addition to the conversation due to the unlikelihood of the scenario, if you save a JPG, even at 100% quality, it will lose quality, however imperceptibly. Thus if you open a JPG, then Save, it will lose data.
