modifying exposure time

[ryan]

Hi there.
I would like to modify the exif exposure times in a set of images by a definable factor e.g. halving them, tripling them etc. Is this possible within the exiftool command line?
Thanks Ryan

[Phil Harvey]

Hi Ryan,

This may be done by creating a user-defined Composite tag based on ExposureTime, then copying the value of this new tag back to ExposureTime.  See the config file documentation for examples of how to create user-defined tags.

- Phil

[ryan]

Thanks Phil.
Ryan