Actually Zenphoto always uses the filename (minus suffix) as the title if it is not set via EXIF or later entered on the backend.
If you want the filename to display on your site itself, there are functions available to do this. Please see the documentation. Requires of course changing the theme.
If you don't assign a specific title when you upload the images, the filename is used, I believe. At least, that's how it works for me, but I move images into the album folder directly instead of using the upload utility.
You could certainly edit your theme to display the filename instead of the title. You would have to change the calls of `printImageTitle()` to `echo $_zp_current_image->getFileName()`.
If you would prefer to take the alternate route, there are plenty of programs to edit EXIF info out there. Which one you choose is all a matter of preference.
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If you want the filename to display on your site itself, there are functions available to do this. Please see the documentation. Requires of course changing the theme.
If you would prefer to take the alternate route, there are plenty of programs to edit EXIF info out there. Which one you choose is all a matter of preference.