Jeff Schewe wrote:
The entire file (including image data) get's rewitten? You think that? Then you don't understand the way .xmp is written to the headers of files.
Well one of us certainly doesn't understand it.
Jeff Schewe wrote:
It may be that if a header gets too full, the headers will be rewitten to expand the header padding. At no time (that I'm aware of) does that require rewritting the image data in the file.
Once the xmp pad is exhausted, the entire file is re-written (you can't insert more data in the front of a file without rewriting the part that comes after (which includes image data) - see "Computers 101"). I mean, if you write your own operating system, then you can - but we're talking about Windows & Mac, right? I'm making the assumption that Adobe did not write their own low-level IO functionality, thus bypassing the operating system. If they did, then I will eat crow, apologize, beg for forgiveness, ... (but I seriously doubt they did that).
So, the file will never be re-written no matter how many changes are made to pre-existing adjustments, but when painting..., the file must be re-written periodically (with a new pad).
Rob