You know, I really don't advise that this be done. And I will tell you why.
It is a pretty rare event that in a collection as large as that you are going to see a image problem that is across the board. By that I mean that you are not going to have exact same problem in every shot. Especially when you are trying to address multiple issues with a single action.
So let's just look at a scenario where you are addressing one issue per action. Let's say you are trying to adjust the brightness. You pull a test image, record the action and then run it. The chances that you are going to get pleasing results in every image by adjusting it per the test image are pretty small. I am sure that a number of them will be "good enough" but alot of them are going to be still too dark. Others will have been adjusted to the other side where now they are too bright. And a small number of them are going to be perfect.
Now I know that it seems like a daunting task, but you really ought to handle image correction on a image by image basis. It is just a part of digital image house keeping, a task that has to be done as the images come in. Now if I were you I would either sit and decide to handle a pertion of the mass per week until you are caught up or just resolve yourself to correct the images as they come up for use. Whichever you choose take my advice and handle your image correction as the images are shot from now on.
And I'm not just talking out of theory. Yesterday I shoot just under 500 images. And trust me, the temptation to just download those shots and not worry about it is HUGE. But I am going to knock out the hard work now that way it doesn't build up on me.
- Digital Prophet -
Canon 300D, Canon 5D and some glass and some stuff.
"Your cooking makes me question my faith." - Bucky Katt