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PSA SE never changes the format of pictures. So this is not what you're seeing.
Where did the pictures come from? Were they JPEGs on your hard drive which you then imported into PSA SE?
Thanks for your response. Yes, they are .jpg files transferrred to my hard drive directly from the camera.
I have since noticed that the files earlier in the listing (latest dates) do not show this phenomenon, but once the change started, the rest of the files (back to the beginning shots) all seem to show as .tif files in APA. These were all made with the same camera with the same settings (resolution, etc.).
> they are .jpg files transferrred to my hard drive directly from the camera
How did you do the transfer?
Some cameras are provided with TWAIN driver which screws up files in this fashion. For most cameras, you don't need to install any software, as Windows sees them as a "drive" and can manage unaided. Does this ring any bells?
With all due respect, I don't believe the method of transfer is the issue. The camera is a Canon, and they were all transferred via Canon's Zoombrowser program that came with it. It has not caused any problems before that I know of.
When I look up the file in Windows Explorer I find that the file in question is an extra file obviously based on an existing photo file, and when I look at its properties, it is only 52.0 kb "size on disk". (Hence, the "jaggies"!) Further, the file (which is a Christmas 2004 picture) was created in June 2005, but modified in February 2005! I never mess with the file dates, so this is also part of the error.
All I am saying is that I'm 99.999% certain that PSA SE isn't doing this. The SE version doesn't even include this functionality for you to select, let alone doing it by itself.
Have the orginial JPEGs disappeared?
No, the originals are still there.
That's good news. But leaves the question of where these silly TIFFs are coming from. As I said, I really don't think PSA SE is doing it. Can you setp through the process of taking a single pic, moving it on to your PC and importing into PSA SE, checking exactly when this TIFF shows up.