On this image:

enter image description here

When I choose the "Select by Color Tool," it highlights all the black regions,

enter image description here

I only want it to choose the "slightly" black regions (which is the background), in another painting program (its name is paint.NET) there's this "tolerance" bar:

enter image description here

Does GIMP also have it? I want it so I can decrease the tolerance to a certain extent so that it only highlights the "slightly black" regions.

  • Yes there's a threshold slider in the tool options, but what is the ultimate goal of your edit? You may find there is a better solution if you explain your actual problem and show the original starting image. Can you edit your question to clarify. Thanks.
    – Billy Kerr
    Jul 24, 2019 at 9:23

1 Answer 1


In the Tool Options dockable dialog the options for the currently selected tool are shown. After picking the Fuzzy Select Tool there is a slider labeled Threshold which has a similar function.

If you cannot see this dockable dialog it can be enabled through WindowsDockable DialogsTool Options.

Threshold slider

  • I tried it and it also picked all the black regions, have any other way?
    – Qataada
    Jul 23, 2019 at 15:07
  • If you want to select the partially transparent pixels, note that they have the same color - black - but a different alpha value. Jul 23, 2019 at 17:07
  • 3
    Looks like a XY problem. What is the real problem? Each time I see this kind of question popping up it is someone trying to handle anti-aliasing pixels. Maybe should you have a look at [this]( gimp-forum.net/…).
    – xenoid
    Jul 23, 2019 at 18:18

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