rehess wrote:
That is the whole issue: only the final version is saved as JPEG; only one write - many reads, but not written back to media.
Often when I'm working on a file, I do multiple saves so I don't lose data. I suspect graphics users (I'm not one) do multiple backups...
Quote:
I am treating JPEGs as slides - except that repeated viewing doesn't do any harm!
Strictly as a viewer... then the data is disturbed only once when accessed... unless it is discarded.
Quote:
The Win photo viewer does not write; the iPhone photo viewer does not write; ad nauseam
If the file is opened and saved (unless discarded) the file is changed. JPEG causes changes because it defaults to a data compression engine at heart.