Hello folks,
Is there a way in GIMP to enter manually the input and output values of a color curve like in Photoshop.
I’m really missing this:

It’s driving me a bit nuts 
I have to build a curve to calibrate the paper i will use to print some cyanotypes from digital negative and i would have love to make it simple but if it’s not possible i’ll go back to photoshop, or try to master the mouse to edit the points manually 
Cheers
Jean-Philippe.