I figured out what happened: when I asked Gimp to do a "Save As",
it popped up a small window, proposing to save the file in the /cdrom
directory the original TIF had been read from. When I asked to select
a different directory, that window expanded to show a file-tree listing.
When I asked to save it by file extension PNG, that enlarged the window
*again* to offer a menu of extensions, pushing the bottom of it off the
bottom of my screen. But this put the progress bar well off the screen.
So, after telling Gimp to save the file, I waited the few seconds that
I thought should be enough, and exited from the Gimp. Unfortunately,
this big file was only partly written; Gimp takes about a minute to
write the 11-MB PNG version, I find.
When I told it to Quit, it didn't object that the file was only partly
written; as it objects when there are changes to be saved, I figured
all was well, and only discovered the corrupt (i.e., incomplete) file
when I tried to use it later.
The problem here is twofold: (1) Gimp let the progress bar be pushed
off the visible area of the screen; and (2) it didn't complain (as I
had expected it would have) when I asked it to quite before the file
was completely written.
I'd call this a user-interface problem. You probably consider it a
stupid-user problem. Anyway, I now see what the problem is; and it is
indeed a consequence of the file being so big.
-- A. T. Young
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