what to do to apply the same correction to all the photos with a single action
I would suggest trying the raw editor with a small batch.
File >> Open in Camera Raw
Select all from the left hand filmstrip
Experiment with the tint slider e.g. magenta is the opposite of green on the color wheel - see image.
You might also try the temperature slider to warm or cool the images.
When done, click the button (bottom-right) “Open Images” to send them into the rgular editing workspace where you can re-save.
thank you so much for your reply. last but not least: I've a lot of images that has been scanned from slides. most are uncorrectly rotated. question: how can rotate horizontally them quickly, with one shot??
thank you again for your valuable support
If you are using the Organizer, you can select all the files and use the rotation button in the lower tool bar.
but I do not use Organizer in order to avoid to use the hard disk memory that is limited (SSD) if compared to the amount of photography data (close to 1GB). I rely upon an external HD.