Color picker doesn't reflect changes by color curve tool

[mmhmjanssen]

Using the pencil tool I created 10 big dots with the same Green en Blue value but with the Red value ranging from 10, 20, 30 etc to 100%, I used the Color Curve tool to modify the Red component only. While the colors on the screen truly reflect the changes, the Color Picker tool still shows exactly the same color as before applying the Curve Tool. I have to export the image and reload it into GIMP before I get the actual colors in the Color Picker tool. Am I missing something, or is this a bug?

[rich2005]

Not a bug as such but can be an annoyance.

Gimp 3 has layer effects - that fx you see in the layers dock.  That is a sort of invisible layer which lets you see what effect the tool will make without affecting the layer itself. It also allows going back and make corrections if the user does not like the effect.

see: https://docs.gimp.org/3.0/en/gimp-using-...fects.html

Two ways to get what you want
(1) Enable Merge filter in the tool dialogue.
or
(2) Click on the fx in the layer and there are options to apply - delete - hide.....