I have a timestamp that's in the bottom left of every photo from a bad export from a long time ago. I want to remove them, which works perfectly by selecting the area with the marquee and going up to edit -> fill -> content aware. Awesome!
The problem is I have to do this with 10,000 images. So, with some Googling, I learned how to create a Photoshop Action by recording the above tasks and then I went to file -> automate, selected my folder, and it worked. Awesome!
For a minute, until I realized that not all of my images are the same height, and Photoshop is basing my actions from the top of the photo, not the bottom. If I could position my marquee based on the x,y of the bottom left of my image, I would be good to go, but I don't see how to do this.