how to apply curves to multiple images?

[rich2005]

(8 hours ago)estatistics Wrote: how to apply curves to multiple images?

Or in more general sense, how to apply a set of operations, in multiple images at once?
Yes, i know about batch mode.

Somewhere i read to import them as the layers of a single image, then how you saved them as individual images?

I normally go for BIMP, but you already know about batch curves.  

For an image with individual layers you could try the gmic_gimp_qt plugin. That has a curves filter, which I like, more choice of type but does not use Gimp curve files.

Use it once to determine a curve, then apply to a stack of images as:

   

You can save as a "fave" for use later if you want

Then there are several utilities to export layers to individual files. Ofnuts has a python plugin or I use an old script-fu