rob_cole_2221866's profile

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Sun, Mar 31, 2013 10:41 PM

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Lightroom: How to tell if the Lr (standard) previews need to be updated?

Any of you Lr/database wizards got any idea?

I have a plugin that auto-sets the black and/or white point (on point curve) - it uses histogram computed from extracted previews. Works fine as long as the previews are up to date, but I don't yet have any way of determining if previews are up to date.

Preview database field? Date-time compare?

PS - comparing the preview file times to last edit time doesn't work reliably (e.g. last-edit time sometimes lags substantially, and refers to metadata not just dev changes...).

R

4.5K Messages

 • 

76.3K Points

9 y ago

Present work-around: pass responsibility to plugin user, thusly:

Present dialog box with instructions.
User can dismiss temporarily to review thumbs and/or loupe display and decide for him/her-self whether all lib previews have been updated, then
Click button to continue...

Not very satisfying, but at least plugin is no longer trying to make a decision when it can't be sure of the answer (now user is being forced to make a decision when he/she will probably not be sure of the answer ;-}).

R