EDIT: I use X11 now and I have no problem.

I've seen many apps posted here, but right now in my laptop with 19.10 none of them work.

I've tried Agave, Gpick, and Grabc .

They all give back the color black regardless of where I put the cursor on #000000

  • is there a workaround?
    – igorgue
    Oct 24, 2019 at 22:14
  • 1
    Are you really using 9.10, or did you mean to type 19.10? Please click edit and fix it if that's what you meant.
    – K7AAY
    Oct 24, 2019 at 22:17
  • 2
    That's expected behavior if you are using Wayland. In Wayland, applications do not have permission to see pixels outside their own box. (Yes, it's a reported bug). The workaround is to logout and login to an X session. Use the little 'gear' icon on your password screen to select Ubuntu using X.
    – user535733
    Oct 24, 2019 at 22:32
  • Ubuntu 9.10 from 2009-October? or Ubuntu 19.10 from 2019-October. There is a decade of difference between them...
    – guiverc
    Oct 24, 2019 at 23:02
  • Sorry all! Yeah I meant 19.10
    – igorgue
    Oct 25, 2019 at 18:42

2 Answers 2


Here is a workaround.

Open your image, a screenshot you made or a web page with Firefox.


In Firefox go to : Tools > Web Developer > Eyedropper

Left click on the color you want. It's copied in the clipboard.

For example : Hex: #497FC1


Here is the X11 native solution that

  • doesn't require any external packages like Agave, Gpick, or Grabc etc.
  • and it doesn't limit to web pages (like the previous answer) either

Just run xmag. From its man page:

  • The xmag program allows you to magnify portions of an X screen.
  • The area can be dragged out to the desired size by pressing Button 2.
  • Once a region has been selected, a window is popped up showing a blown up version of the region in which each pixel in the source image is represented by a small square of the same color.
  • "Pressing Button1 in the enlargement window shows the position and RGB value of the pixel under the pointer until the button is released" -- this, is the X11 native solution for Color Picker.

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